Finite Group Databasebeta

← C31×#61012 #21517771

Subgroups — C31×#61012 #21517771

Order 7936.

1776 conjugacy classes of subgroups.

The subgroup lattice has 614 nodes — too large to display as a diagram.

Conjugacy classes of subgroups

#subgroupG/Hclass sizemultiplicitynormal?properties
1C31×#3509C211yesmaximal, characteristic, complemented
2C31×#3508C211yesmaximal, characteristic
3C31×#3260C214yesmaximal, complemented
4C31×#3231C212yesmaximal, complemented
5C31×#3228C212yesmaximal, complemented
6C31×#3208C212yesmaximal, complemented
7C31×#3206C212yesmaximal, complemented
8C31×#3200C214yesmaximal, complemented
9C31×#3182C212yesmaximal, complemented
10C31×#3167C212yesmaximal, complemented
11C31×#3126C214yesmaximal, complemented
12C31×#3123C214yesmaximal, complemented
13C31×#2922C211yesmaximal, characteristic, complemented
14C31×#559—22no—
15C31×#557—22no—
16C31×#556—22no—
17C31×#552—22no—
18C31×#552—22no—
19C31×#550—22no—
20C31×#546—22no—
21C31×#546—22no—
22C31×#541C2212yes—
23C31×#541C2212yescomplemented
24C31×#540C2212yes—
25C31×#540C2212yes—
26C31×#536C2212yes—
27C31×#535C2212yes—
28C31×#533C2212yes—
29C31×#533C2211yescharacteristic
30C31×#533C2212yescomplemented
31C31×#533C2211yescharacteristic, complemented
32C31×#532C2212yes—
33C31×#532C2212yes—
34C2×C31×C4⋊Q8C2211yescharacteristic, complemented
35C2×C31×#127C2211yescharacteristic
36C31×#519C2212yescomplemented
37C31×#518C2212yes—
38C4×#41×C31C2211yescharacteristic
39C31×#500C2212yescomplemented
40C31×#498C2212yescomplemented
41C31×#492C2212yes—
42C31×#492C2212yes—
43C31×#487C2212yescomplemented
44C31×#487C2212yescomplemented
45C31×#486C2212yes—
46C31×#486C2212yes—
47C31×#485C2218yes—
48C31×#482C2218yescomplemented
49C31×#479C2218yescomplemented
50C31×#478C2218yescomplemented
51C31×#468C2218yescomplemented
52C31×#465C2218yescomplemented
53C31×#461C2218yescomplemented
54C31×#460C2218yes—
55C31×#450C2218yes—
56C31×#448C2218yescomplemented
57C31×#440C2218yescomplemented
58C4×SD16×C31C2218yescomplemented
59C31×#433C2212yes—
60C31×#433C2212yescomplemented
61C31×#431C2212yes—
62C31×#431C2212yescomplemented
63C31×#424C2212yescomplemented
64C31×#408C2212yes—
65C4×M16×C31C2211yescharacteristic, complemented
66C2×C4×C8×C31C2211yescharacteristic, complemented
67C2×#41×C31—22no—
68C2×#41×C31—22no—
69C2×#41×C31C2311yescharacteristic
70C22×Q8×C31C2312yes—
71C22×D4×C31—22no—
72C22×D4×C31C2312yes—
73C2×SD16×C31C2318yes—
74C2×SD16×C31C2318yes—
75C2×M16×C31C2312yes—
76C22×C8×C31C2312yes—
77C31×C4⋊Q8—22no—
78C31×C4⋊Q8—22no—
79C31×C4⋊Q8C2312yes—
80C31×C4⋊Q8C2312yes—
81C31×C4⋊Q8C2312yes—
82C31×C4⋊Q8C2312yes—
83C31×#127—22no—
84C31×#127—22no—
85C31×#127C2312yes—
86C31×#127C2312yes—
87C31×#126—24no—
88C31×#126—24no—
89C31×#125—24no—
90C31×#125—24no—
91C31×#125—22no—
92C31×#125—22no—
93C31×#125C2312yes—
94C31×#125C2312yes—
95C31×#124—22no—
96C31×#124—22no—
97C31×#124—22no—
98C31×#124—22no—
99C31×#123—22no—
100C31×#123—22no—
101C31×#123—24no—
102C31×#123—24no—
103C31×C22⋊Q8—22no—
104C31×C22⋊Q8—22no—
105C31×C22⋊Q8—22no—
106C31×C22⋊Q8—22no—
107C31×C22⋊Q8C2314yes—
108C31×C22⋊Q8C2314yes—
109C31×#121—22no—
110C31×#121—22no—
111C31×#121—24no—
112C31×#121—24no—
113C31×#121C2314yes—
114C31×#121C2314yes—
115C31×#120—22no—
116C31×#120—22no—
117C4×Q8×C31—24no—
118C4×Q8×C31—22no—
119C4×Q8×C31—22no—
120C4×Q8×C31—22no—
121C4×Q8×C31—22no—
122C4×Q8×C31D412yes—
123C4×Q8×C31C2314yes—
124C4×Q8×C31C2314yes—
125C4×D4×C31—24no—
126C4×D4×C31—22no—
127C4×D4×C31—22no—
128C4×D4×C31D412yes—
129C4×D4×C31D412yes—
130C4×D4×C31D412yes—
131C4×D4×C31C2314yes—
132C4×D4×C31C2314yes—
133C31×#117—22no—
134C31×#117—22no—
135C31×#117—24no—
136C31×#117C2312yes—
137C31×#117C2312yes—
138C31×#117C2311yescharacteristic
139C31×#117C2311yescharacteristic
140C31×#117C2311yescharacteristic
141C2×C4⋊C4×C31—22no—
142C2×C22⋊C4×C31—24no—
143C2×C42×C31C2311yescharacteristic
144C2×C42×C31C2311yescharacteristic
145C2×C42×C31C2311yescharacteristic
146C31×#107C2318yes—
147C31×#106C2318yes—
148C31×C4⋊C8C2314yes—
149C31×C4⋊C8C2314yes—
150C31×#103C2318yes—
151C31×#103C2318yes—
152C31×#102C2318yes—
153C31×#102C2318yes—
154C31×C22⋊C8C2314yes—
155C31×C22⋊C8C2314yes—
156C31×#97C2312yes—
157C4×C8×C31C2312yes—
158C4×C8×C31C2312yes—
159C4×C8×C31C2312yes—
160C24×C31—22no—
161#41×C31—42no—
162#41×C31—84no—
163#41×C31—84no—
164C2×Q8×C31—22no—
165C2×Q8×C31—22no—
166C2×Q8×C31—22no—
167C2×Q8×C31—44no—
168C2×Q8×C31C2×D411yescharacteristic
169C2×Q8×C31C2414yes—
170C2×D4×C31—24no—
171C2×D4×C31—24no—
172C2×D4×C31—22no—
173C2×D4×C31—22no—
174C2×D4×C31—22no—
175C2×D4×C31—24no—
176C2×D4×C31—44no—
177C2×D4×C31—84no—
178C2×D4×C31C2×D411yescharacteristic
179C2×D4×C31C2×D411yescharacteristic
180C2×D4×C31C2×D411yescharacteristic
181C2×D4×C31C2414yes—
182C22×C4×C31—22no—
183C22×C4×C31—24no—
184C22×C4×C31—24no—
185C22×C4×C31C2×D412yes—
186C22×C4×C31C2×D412yes—
187C22×C4×C31C2×D412yes—
188C22×C4×C31C2411yescharacteristic
189C22×C4×C31C2411yescharacteristic
190C22×C4×C31C2411yescharacteristic
191SD16×C31—48no—
192SD16×C31—48no—
193M16×C31—42no—
194C2×C8×C31—42no—
195C2×C8×C31C2414yes—
196C2×C8×C31C2414yes—
197C4⋊C4×C31—22no—
198C4⋊C4×C31—22no—
199C4⋊C4×C31—24no—
200C4⋊C4×C31—22no—
201C4⋊C4×C31—24no—
202C4⋊C4×C31—24no—
203C4⋊C4×C31—22no—
204C4⋊C4×C31—24no—
205C4⋊C4×C31—24no—
206C4⋊C4×C31—24no—
207C4⋊C4×C31—24no—
208C4⋊C4×C31C2×D412yes—
209C4⋊C4×C31C2×D412yes—
210C4⋊C4×C31C2×D412yes—
211C4⋊C4×C31C2414yes—
212C4⋊C4×C31C2414yes—
213C22⋊C4×C31—22no—
214C22⋊C4×C31—22no—
215C22⋊C4×C31—24no—
216C22⋊C4×C31—24no—
217C22⋊C4×C31—24no—
218C22⋊C4×C31—24no—
219C22⋊C4×C31—24no—
220C22⋊C4×C31—24no—
221C22⋊C4×C31C2×D412yes—
222C22⋊C4×C31C2×D412yes—
223C22⋊C4×C31C2×D412yes—
224C42×C31—24no—
225C42×C31—24no—
226C42×C31—22no—
227C42×C31—22no—
228C42×C31C2×D412yes—
229C42×C31C2×D412yes—
230C42×C31C2×D412yes—
231C42×C31C2411yescharacteristic
232C42×C31C2411yescharacteristic
233C42×C31C2411yescharacteristic
234C42×C31C2411yescharacteristic
235#61012C3111yesmaximal, characteristic, direct product factor, Sylow
236C23×C31—24no—
237C23×C31—44no—
238C23×C31—84no—
239C23×C31C22×D411yescharacteristic
240C23×C31C22×D411yescharacteristic
241C23×C31C22×D411yescharacteristic
242Q8×C31—28no—
243Q8×C31—41no—
244Q8×C31—44no—
245Q8×C31—44no—
246Q8×C31—44no—
247D4×C31—28no—
248D4×C31—41no—
249D4×C31—41no—
250D4×C31—41no—
251D4×C31—44no—
252D4×C31—44no—
253D4×C31—44no—
254D4×C31—84no—
255D4×C31—84no—
256D4×C31—84no—
257C2×C4×C31—24no—
258C2×C4×C31—24no—
259C2×C4×C31—24no—
260C2×C4×C31—22no—
261C2×C4×C31—22no—
262C2×C4×C31—22no—
263C2×C4×C31—24no—
264C2×C4×C31—24no—
265C2×C4×C31—24no—
266C2×C4×C31—44no—
267C2×C4×C31—84no—
268C2×C4×C31—84no—
269C2×C4×C31C22×D411yescharacteristic
270C2×C4×C31C22×D411yescharacteristic
271C2×C4×C31C22×D412yes—
272C2×C4×C31C22×D412yes—
273C2×C4×C31C22×D411yescharacteristic
274C2×C4×C31C22×D412yes—
275C2×C4×C31C22×D412yes—
276C2×C4×C31C2511yescharacteristic
277C8×C31—24no—
278C8×C31—24no—
279#3509C2×C3111yescharacteristic, complemented
280#3508C2×C3111yescharacteristic
281#3260C2×C3114yescomplemented
282#3231C2×C3112yescomplemented
283#3228C2×C3112yescomplemented
284#3208C2×C3112yescomplemented
285#3206C2×C3112yescomplemented
286#3200C2×C3114yescomplemented
287#3182C2×C3112yescomplemented
288#3167C2×C3112yescomplemented
289#3126C2×C3114yescomplemented
290#3123C2×C3114yescomplemented
291#2922C2×C3111yescharacteristic, complemented
292C22×C31—21no—
293C22×C31—21no—
294C22×C31—21no—
295C22×C31—22no—
296C22×C31—22no—
297C22×C31—22no—
298C22×C31—44no—
299C22×C31—44no—
300C22×C31—44no—
301C22×C31—164no—
302C22×C31C23×D411yescharacteristic
303C4×C31—21no—
304C4×C31—21no—
305C4×C31—21no—
306C4×C31—22no—
307C4×C31—22no—
308C4×C31—22no—
309C4×C31—44no—
310C4×C31—44no—
311C4×C31—44no—
312C4×C31#57714yes—
313C4×C31#58512yes—
314#559—22no—
315#557—22no—
316#556—22no—
317#552—22no—
318#552—22no—
319#550—22no—
320#546—22no—
321#546—22no—
322#541C22×C3112yes—
323#541C22×C3112yescomplemented
324#540C22×C3112yes—
325#540C22×C3112yes—
326#536C22×C3112yes—
327#535C22×C3112yes—
328#533C22×C3112yes—
329#533C22×C3111yescharacteristic
330#533C22×C3112yescomplemented
331#533C22×C3111yescharacteristic, complemented
332#532C22×C3112yes—
333#532C22×C3112yes—
334C2×C4⋊Q8C22×C3111yescharacteristic, complemented
335C2×#127C22×C3111yescharacteristic
336#519C22×C3112yescomplemented
337#518C22×C3112yes—
338C4×#41C22×C3111yescharacteristic
339#500C22×C3112yescomplemented
340#498C22×C3112yescomplemented
341#492C22×C3112yes—
342#492C22×C3112yes—
343#487C22×C3112yescomplemented
344#487C22×C3112yescomplemented
345#486C22×C3112yes—
346#486C22×C3112yes—
347#485C22×C3118yes—
348#482C22×C3118yescomplemented
349#479C22×C3118yescomplemented
350#478C22×C3118yescomplemented
351#468C22×C3118yescomplemented
352#465C22×C3118yescomplemented
353#461C22×C3118yescomplemented
354#460C22×C3118yes—
355#450C22×C3118yes—
356#448C22×C3118yescomplemented
357#440C22×C3118yescomplemented
358C4×SD16C22×C3118yescomplemented
359#433C22×C3112yes—
360#433C22×C3112yescomplemented
361#431C22×C3112yes—
362#431C22×C3112yescomplemented
363#424C22×C3112yescomplemented
364#408C22×C3112yes—
365C4×M16C22×C3111yescharacteristic, complemented
366C2×C4×C8C22×C3111yescharacteristic, complemented
367C2×C31—41no—
368C2×C31—41no—
369C2×C31—41no—
370C2×C31—84no—
371C2×C31#344911yescharacteristic
372C2×C31C2×#57712yes—
373C2×#41—22no—
374C2×#41—22no—
375C2×#41C23×C3111yescharacteristic
376C22×Q8C23×C3112yes—
377C22×D4—22no—
378C22×D4C23×C3112yes—
379C2×SD16C23×C3118yes—
380C2×SD16C23×C3118yes—
381C2×M16C23×C3112yes—
382C22×C8C23×C3112yes—
383C4⋊Q8—22no—
384C4⋊Q8—22no—
385C4⋊Q8C23×C3112yes—
386C4⋊Q8C23×C3112yes—
387C4⋊Q8C23×C3112yes—
388C4⋊Q8C23×C3112yes—
389#127—22no—
390#127—22no—
391#127C23×C3112yes—
392#127C23×C3112yes—
393#126—24no—
394#126—24no—
395#125—24no—
396#125—24no—
397#125—22no—
398#125—22no—
399#125C23×C3112yes—
400#125C23×C3112yes—
401#124—22no—
402#124—22no—
403#124—22no—
404#124—22no—
405#123—22no—
406#123—22no—
407#123—24no—
408#123—24no—
409C22⋊Q8—22no—
410C22⋊Q8—22no—
411C22⋊Q8—22no—
412C22⋊Q8—22no—
413C22⋊Q8C23×C3114yes—
414C22⋊Q8C23×C3114yes—
415#121—22no—
416#121—22no—
417#121—24no—
418#121—24no—
419#121C23×C3114yes—
420#121C23×C3114yes—
421#120—22no—
422#120—22no—
423C4×Q8—24no—
424C4×Q8—22no—
425C4×Q8—22no—
426C4×Q8—22no—
427C4×Q8—22no—
428C4×Q8D4×C3112yes—
429C4×Q8C23×C3114yes—
430C4×Q8C23×C3114yes—
431C4×D4—24no—
432C4×D4—22no—
433C4×D4—22no—
434C4×D4D4×C3112yes—
435C4×D4D4×C3112yes—
436C4×D4D4×C3112yes—
437C4×D4C23×C3114yes—
438C4×D4C23×C3114yes—
439#117—22no—
440#117—22no—
441#117—24no—
442#117C23×C3112yes—
443#117C23×C3112yes—
444#117C23×C3111yescharacteristic
445#117C23×C3111yescharacteristic
446#117C23×C3111yescharacteristic
447C2×C4⋊C4—22no—
448C2×C22⋊C4—24no—
449C2×C42C23×C3111yescharacteristic
450C2×C42C23×C3111yescharacteristic
451C2×C42C23×C3111yescharacteristic
452#107C23×C3118yes—
453#106C23×C3118yes—
454C4⋊C8C23×C3114yes—
455C4⋊C8C23×C3114yes—
456#103C23×C3118yes—
457#103C23×C3118yes—
458#102C23×C3118yes—
459#102C23×C3118yes—
460C22⋊C8C23×C3114yes—
461C22⋊C8C23×C3114yes—
462#97C23×C3112yes—
463C4×C8C23×C3112yes—
464C4×C8C23×C3112yes—
465C4×C8C23×C3112yes—
466C31#6101211yescharacteristic, direct product factor, Sylow
467C24—22no—
468#41—42no—
469#41—84no—
470#41—84no—
471C2×Q8—22no—
472C2×Q8—22no—
473C2×Q8—22no—
474C2×Q8—44no—
475C2×Q8C2×D4×C3111yescharacteristic
476C2×Q8C24×C3114yes—
477C2×D4—24no—
478C2×D4—24no—
479C2×D4—22no—
480C2×D4—22no—
481C2×D4—22no—
482C2×D4—24no—
483C2×D4—44no—
484C2×D4—84no—
485C2×D4C2×D4×C3111yescharacteristic
486C2×D4C2×D4×C3111yescharacteristic
487C2×D4C2×D4×C3111yescharacteristic
488C2×D4C24×C3114yes—
489C22×C4—22no—
490C22×C4—24no—
491C22×C4—24no—
492C22×C4C2×D4×C3112yes—
493C22×C4C2×D4×C3112yes—
494C22×C4C2×D4×C3112yes—
495C22×C4C24×C3111yescharacteristic
496C22×C4C24×C3111yescharacteristic
497C22×C4C24×C3111yescharacteristic
498SD16—48no—
499SD16—48no—
500M16—42no—
501C2×C8—42no—
502C2×C8C24×C3114yes—
503C2×C8C24×C3114yes—
504C4⋊C4—22no—
505C4⋊C4—22no—
506C4⋊C4—24no—
507C4⋊C4—22no—
508C4⋊C4—24no—
509C4⋊C4—24no—
510C4⋊C4—22no—
511C4⋊C4—24no—
512C4⋊C4—24no—
513C4⋊C4—24no—
514C4⋊C4—24no—
515C4⋊C4C2×D4×C3112yes—
516C4⋊C4C2×D4×C3112yes—
517C4⋊C4C2×D4×C3112yes—
518C4⋊C4C24×C3114yes—
519C4⋊C4C24×C3114yes—
520C22⋊C4—22no—
521C22⋊C4—22no—
522C22⋊C4—24no—
523C22⋊C4—24no—
524C22⋊C4—24no—
525C22⋊C4—24no—
526C22⋊C4—24no—
527C22⋊C4—24no—
528C22⋊C4C2×D4×C3112yes—
529C22⋊C4C2×D4×C3112yes—
530C22⋊C4C2×D4×C3112yes—
531C42—24no—
532C42—24no—
533C42—22no—
534C42—22no—
535C42C2×D4×C3112yes—
536C42C2×D4×C3112yes—
537C42C2×D4×C3112yes—
538C42C24×C3111yescharacteristic
539C42C24×C3111yescharacteristic
540C42C24×C3111yescharacteristic
541C42C24×C3111yescharacteristic
542C23—24no—
543C23—44no—
544C23—84no—
545C23C22×D4×C3111yescharacteristic
546C23C22×D4×C3111yescharacteristic
547C23C22×D4×C3111yescharacteristic
548Q8—28no—
549Q8—41no—
550Q8—44no—
551Q8—44no—
552Q8—44no—
553D4—28no—
554D4—41no—
555D4—41no—
556D4—41no—
557D4—44no—
558D4—44no—
559D4—44no—
560D4—84no—
561D4—84no—
562D4—84no—
563C2×C4—24no—
564C2×C4—24no—
565C2×C4—24no—
566C2×C4—22no—
567C2×C4—22no—
568C2×C4—22no—
569C2×C4—24no—
570C2×C4—24no—
571C2×C4—24no—
572C2×C4—44no—
573C2×C4—84no—
574C2×C4—84no—
575C2×C4C22×D4×C3111yescharacteristic
576C2×C4C22×D4×C3111yescharacteristic
577C2×C4C22×D4×C3112yes—
578C2×C4C22×D4×C3112yes—
579C2×C4C22×D4×C3111yescharacteristic
580C2×C4C22×D4×C3112yes—
581C2×C4C22×D4×C3112yes—
582C2×C4C25×C3111yescharacteristic
583C8—24no—
584C8—24no—
585C22—21no—
586C22—21no—
587C22—21no—
588C22—22no—
589C22—22no—
590C22—22no—
591C22—44no—
592C22—44no—
593C22—44no—
594C22—164no—
595C22C23×D4×C3111yescharacteristic
596C4—21no—
597C4—21no—
598C4—21no—
599C4—22no—
600C4—22no—
601C4—22no—
602C4—44no—
603C4—44no—
604C4—44no—
605C4C31×#57714yes—
606C4C31×#58512yes—
607C2—41no—
608C2—41no—
609C2—41no—
610C2—84no—
611C2C31×#344911yescharacteristic
612C2C2×C31×#57712yes—
subgroupG/H
center, socleC22×C31C23×D4
commutator, Frattini, cosocleC2×C4C25×C31
prime radicalC31×#3508C2
LCSG ▷ C2×C4 ▷ C2 ▷ C1
UCSC1 ◁ C22×C31 ◁ C4×#41×C31 ◁ G

Complements

Splittings G = N ⋊ H with N normal; H ≅ G/N.

NH ≅ G/Ntype
1. C31×#3509C2semidirect
3. C31×#3260C2semidirect
4. C31×#3231C2semidirect
5. C31×#3228C2semidirect
6. C31×#3208C2semidirect
7. C31×#3206C2semidirect
8. C31×#3200C2semidirect
9. C31×#3182C2semidirect
10. C31×#3167C2semidirect
11. C31×#3126C2semidirect
12. C31×#3123C2semidirect
13. C31×#2922C2semidirect
23. C31×#541C22semidirect
30. C31×#533C22semidirect
31. C31×#533C22semidirect
34. C2×C31×C4⋊Q8C22semidirect
36. C31×#519C22semidirect
39. C31×#500C22semidirect
40. C31×#498C22semidirect
43. C31×#487C22semidirect
44. C31×#487C22semidirect
48. C31×#482C22semidirect
49. C31×#479C22semidirect
50. C31×#478C22semidirect
51. C31×#468C22semidirect
52. C31×#465C22semidirect
53. C31×#461C22semidirect
56. C31×#448C22semidirect
57. C31×#440C22semidirect
58. C4×SD16×C31C22semidirect
60. C31×#433C22semidirect
62. C31×#431C22semidirect
63. C31×#424C22semidirect
65. C4×M16×C31C22semidirect
66. C2×C4×C8×C31C22semidirect
235. #61012C31direct (N × H)
279. #3509C2×C31semidirect
281. #3260C2×C31semidirect
282. #3231C2×C31semidirect
283. #3228C2×C31semidirect
284. #3208C2×C31semidirect
285. #3206C2×C31semidirect
286. #3200C2×C31semidirect
287. #3182C2×C31semidirect
288. #3167C2×C31semidirect
289. #3126C2×C31semidirect
290. #3123C2×C31semidirect
291. #2922C2×C31semidirect
323. #541C22×C31semidirect
330. #533C22×C31semidirect
331. #533C22×C31semidirect
334. C2×C4⋊Q8C22×C31semidirect
336. #519C22×C31semidirect
339. #500C22×C31semidirect
340. #498C22×C31semidirect
343. #487C22×C31semidirect
344. #487C22×C31semidirect
348. #482C22×C31semidirect
349. #479C22×C31semidirect
350. #478C22×C31semidirect
351. #468C22×C31semidirect
352. #465C22×C31semidirect
353. #461C22×C31semidirect
356. #448C22×C31semidirect
357. #440C22×C31semidirect
358. C4×SD16C22×C31semidirect
360. #433C22×C31semidirect
362. #431C22×C31semidirect
363. #424C22×C31semidirect
365. C4×M16C22×C31semidirect
366. C2×C4×C8C22×C31semidirect
466. C31#61012direct (N × H)

Maximal subgroups

By isomorphism type — maximal subgroups of the same type appear once, whether or not they are normal.

subgroupindex
C31×#35092
C31×#35082
C31×#32602
C31×#32312
C31×#32282
C31×#32082
C31×#32062
C31×#32002
C31×#31822
C31×#31672
C31×#31262
C31×#31232
C31×#29222
#6101231