Finite Group Databasebeta

← C2×#10614468 #12969852

Subgroups — C2×#10614468 #12969852

Order 1280.

2374 conjugacy classes of subgroups.

The subgroup lattice has 666 nodes — too large to display as a diagram.

Conjugacy classes of subgroups

#subgroupG/Hclass sizemultiplicitynormal?properties
1C22×C5×C22⋊Q8C211yesmaximal, characteristic, complemented
2C2×#66125C211yesmaximal, characteristic
3C2×#65517C211yesmaximal, characteristic, complemented
4C2×#65516C211yesmaximal, characteristic, complemented
5C22×C22⋊#168C211yesmaximal, characteristic, complemented
6#10614468C2116yesmaximal, direct product factor
7C2×#65336C212yesmaximal, complemented
8C2×#65340C212yesmaximal, complemented
9C2×#65337C212yesmaximal, complemented
10C2×#65334C212yesmaximal, complemented
11C2×#65260C211yesmaximal, characteristic, complemented
12C2×#65256C211yesmaximal, characteristic, complemented
13C23×C5×Q8C2211yescharacteristic
14C24×C4×C5C2211yescharacteristic
15C22×#709C2211yescharacteristic
16C2×C5×C22⋊Q8—21no—
17C2×C5×C22⋊Q8—21no—
18C2×C5×C22⋊Q8—24no—
19C2×C5×C22⋊Q8C2212yes—
20C2×C5×C22⋊Q8C2212yes—
21C2×C5×C22⋊Q8C2218yescomplemented
22C22×C5×C4⋊C4—21no—
23C22×C5×C4⋊C4C2211yescharacteristic
24C22×C5×C22⋊C4—21no—
25C2×#4099—21no—
26C22×#689C2212yescomplemented
27C22×#688C2212yescomplemented
28#66125—24no—
29#66125C2218yes—
30C2×#4076C2211yescharacteristic
31C2×#4076C2211yescharacteristic
32C2×#4075—21no—
33C2×C4×C22⋊D5—21no—
34C2×C4×C22⋊D5—21no—
35C2×#4072C2211yescharacteristic
36C2×#4070C2211yescharacteristic
37C2×#4070C2211yescharacteristic
38C23×#168C2212yes—
39#65517C2218yescomplemented
40#65516C2218yescomplemented
41C2×#3967C2212yescomplemented
42C2×#3967C2212yescomplemented
43C2×C22⋊#168C2211yescharacteristic
44C2×C22⋊#168C2211yescharacteristic
45C2×C22⋊#168C2212yes—
46C2×C22⋊#168C2218yescomplemented
47#65340C22116yescomplemented
48#65337C22116yescomplemented
49#65336C22116yescomplemented
50#65334C22116yescomplemented
51#65260C2218yescomplemented
52C2×#3942C2212yescomplemented
53#65256C2218yescomplemented
54C2×#3941C2212yescomplemented
55C2×#3940C2212yescomplemented
56C2×#3939C2212yescomplemented
57C2×#3190—51nomaximal, Sylow
58C25×C5D411yescharacteristic
59C22×C5×Q8—21no—
60C22×C5×Q8—22no—
61C22×C5×Q8—44no—
62C22×C5×Q8C2312yes—
63C22×C5×Q8C2314yes—
64C23×C4×C5—21no—
65C23×C4×C5—21no—
66C23×C4×C5—44no—
67C23×C4×C5D411yescharacteristic
68C23×C4×C5D411yescharacteristic
69C23×C4×C5D411yescharacteristic
70C23×C4×C5D414yes—
71C23×C4×C5C2311yescharacteristic
72C23×C4×C5C2311yescharacteristic
73C23×C4×C5C2311yescharacteristic
74C23×C4×C5C2314yes—
75C22×C22⋊D5—21no—
76C22×C22⋊D5—21no—
77C22×C22⋊D5—21no—
78C2×#709—22no—
79C2×#709—44no—
80C2×#709C2314yes—
81C22×D20C2311yescharacteristic
82C22×C4×D5—21no—
83C22×Dic10C2311yescharacteristic
84C5×C22⋊Q8—24no—
85C5×C22⋊Q8—24no—
86C5×C22⋊Q8—28no—
87C5×C22⋊Q8—28no—
88C5×C22⋊Q8C2318yes—
89C5×C22⋊Q8C2318yes—
90C2×C5×C4⋊C4—22no—
91C2×C5×C4⋊C4—22no—
92C2×C5×C4⋊C4—28no—
93C2×C5×C4⋊C4—21no—
94C2×C5×C4⋊C4—22no—
95C2×C5×C4⋊C4C2312yes—
96C2×C5×C4⋊C4C2314yes—
97C2×C5×C22⋊C4—22no—
98C2×C5×C22⋊C4—22no—
99C2×C5×C22⋊C4—28no—
100#4099—28no—
101C2×C22⋊Dic5—21no—
102C2×C22⋊Dic5—21no—
103C2×C22⋊Dic5—21no—
104C2×#689—44no—
105C2×#689C2318yescomplemented
106C2×#688—44no—
107C2×#688C2318yescomplemented
108#4076—22no—
109#4076—22no—
110#4076C2314yes—
111#4076C2314yes—
112#4075—28no—
113C4×C22⋊D5—28no—
114C4×C22⋊D5—28no—
115C2×#685—21no—
116C2×#685—21no—
117#4072—22no—
118#4072C2314yes—
119C2×C4⋊Dic5C2311yescharacteristic
120C2×C4⋊Dic5C2311yescharacteristic
121#4070—22no—
122#4070—22no—
123#4070C2314yes—
124#4070C2314yes—
125C2×#683—21no—
126C2×#683—21no—
127C2×C4×Dic5—21no—
128C22×#168—44no—
129C22×#168C2312yes—
130C22×#168C2312yes—
131C22×#168C2318yes—
132#3967C2318yescomplemented
133#3967C2318yescomplemented
134C22⋊#168C2318yes—
135C22⋊#168C2314yes—
136C22⋊#168C2314yes—
137#3942C2318yescomplemented
138#3941C2318yescomplemented
139#3940C2318yescomplemented
140#3939C2318yescomplemented
141C2×#525—51no—
142C22×C22⋊Q8D511yescharacteristic, complemented
143#3190—516no—
144C2×#485—52no—
145C2×#483—51no—
146C2×#480—51no—
147C2×#467—52no—
148C2×#465—52no—
149C2×#452—52no—
150C2×#451—51no—
151C2×#448—51no—
152C22×C22⋊C8—51no—
153C24×C5—24no—
154C24×C5—24no—
155C24×C5—42no—
156C24×C5C2×D411yescharacteristic
157C24×C5C2×D414yes—
158C24×C5C2×D411yescharacteristic
159C24×C5C2×D411yescharacteristic
160C23×D5—21no—
161C2×C5×Q8—24no—
162C2×C5×Q8—22no—
163C2×C5×Q8—24no—
164C2×C5×Q8—24no—
165C2×C5×Q8—48no—
166C2×C5×Q8—44no—
167C2×C5×Q8—48no—
168C2×C5×Q8C2414yes—
169C22×C4×C5—24no—
170C22×C4×C5—24no—
171C22×C4×C5—24no—
172C22×C4×C5—24no—
173C22×C4×C5—22no—
174C22×C4×C5—24no—
175C22×C4×C5—22no—
176C22×C4×C5—48no—
177C22×C4×C5—48no—
178C22×C4×C5—42no—
179C22×C4×C5—42no—
180C22×C4×C5—42no—
181C22×C4×C5—44no—
182C22×C4×C5—44no—
183C22×C4×C5C2×D411yescharacteristic
184C22×C4×C5C2×D411yescharacteristic
185C22×C4×C5C2×D411yescharacteristic
186C22×C4×C5C2×D412yes—
187C22×C4×C5C2×D412yes—
188C22×C4×C5C2×D412yes—
189C22×C4×C5C2×D414yes—
190C22×C4×C5C2×D414yes—
191C22×C4×C5C2×D414yes—
192C22×C4×C5C2412yes—
193C22×C4×C5C2412yes—
194C22×C4×C5C2412yes—
195C22×C4×C5C2411yescharacteristic
196C2×C22⋊D5—24no—
197C2×C22⋊D5—24no—
198C2×C22⋊D5—24no—
199C2×C22⋊D5—44no—
200C2×C22⋊D5—44no—
201C2×C22⋊D5—44no—
202C22×Dic5—21no—
203C22×Dic5—21no—
204C22×Dic5—21no—
205#709—48no—
206#709—48no—
207C2×D20—24no—
208C2×D20—21no—
209C2×D20C2412yes—
210C2×C4×D5—24no—
211C2×C4×D5—44no—
212C2×Dic10—24no—
213C2×Dic10—21no—
214C2×Dic10C2412yes—
215C5×C4⋊C4—28no—
216C5×C4⋊C4—28no—
217C5×C4⋊C4—24no—
218C5×C4⋊C4—22no—
219C5×C4⋊C4C2414yes—
220C5×C22⋊C4—28no—
221C5×C22⋊C4—28no—
222C22⋊Dic5—24no—
223C22⋊Dic5—24no—
224C22⋊Dic5—24no—
225#689—48no—
226#688—48no—
227#685—24no—
228#685—24no—
229C4⋊Dic5—21no—
230C4⋊Dic5—21no—
231C4⋊Dic5C2412yes—
232C4⋊Dic5C2412yes—
233#683—24no—
234#683—24no—
235C4×Dic5—24no—
236C2×#168—24no—
237C2×#168—24no—
238C2×#168—48no—
239C2×#168C2414yes—
240C2×#168C2414yes—
241C22×#41—51no—
242C23×Q8C2×D511yescharacteristic
243C24×C4C2×D511yescharacteristic
244C22×Q16—52no—
245C22×SD16—52no—
246C23×C8—52no—
247#525—58no—
248#525—104no—
249C2×#123—101no—
250C2×C22⋊Q8—21no—
251C2×C22⋊Q8—21no—
252C2×C22⋊Q8—24no—
253C2×C22⋊Q8—51no—
254C2×C22⋊Q8—51no—
255C2×C22⋊Q8C2×D512yes—
256C2×C22⋊Q8C2×D512yes—
257C2×C22⋊Q8C2×D518yescomplemented
258C2×#121—51no—
259C2×#121—51no—
260C2×#120—101no—
261C2×C4×D4—101no—
262C2×C4×D4—101no—
263C2×#117—51no—
264C22×C4⋊C4—21no—
265C22×C4⋊C4C2×D511yescharacteristic
266C22×C22⋊C4—21no—
267#485—516no—
268#483—58no—
269#480—58no—
270#467—516no—
271#465—516no—
272#452—516no—
273#451—58no—
274#448—58no—
275C2×#107—52no—
276C2×#106—52no—
277C2×#103—52no—
278C2×#103—52no—
279C2×#103—52no—
280C2×#102—52no—
281C2×C22⋊C8—51no—
282C2×C22⋊C8—51no—
283C2×C22⋊C8—52no—
284C2×C22⋊C8—58no—
285C23×C5—22no—
286C23×C5—22no—
287C23×C5—22no—
288C23×C5—22no—
289C23×C5—22no—
290C23×C5—28no—
291C23×C5—22no—
292C23×C5—28no—
293C23×C5—22no—
294C23×C5—44no—
295C23×C5—416no—
296C23×C5#13514yes—
297C23×C5#13714yes—
298C23×C5C22×D412yes—
299C23×C5C22×D412yes—
300C23×C5C22×D412yes—
301C23×C5C22×D411yescharacteristic
302C22×D5—22no—
303C22×D5—42no—
304C22×D5—42no—
305C22×D5—42no—
306C5×Q8—24no—
307C5×Q8—24no—
308C5×Q8—48no—
309C5×Q8—44no—
310C2×C4×C5—22no—
311C2×C4×C5—22no—
312C2×C4×C5—22no—
313C2×C4×C5—24no—
314C2×C4×C5—24no—
315C2×C4×C5—24no—
316C2×C4×C5—24no—
317C2×C4×C5—24no—
318C2×C4×C5—24no—
319C2×C4×C5—24no—
320C2×C4×C5—24no—
321C2×C4×C5—44no—
322C2×C4×C5—44no—
323C2×C4×C5—44no—
324C2×C4×C5—48no—
325C2×C4×C5—44no—
326C2×C4×C5—48no—
327C2×C4×C5—44no—
328C2×C4×C5C22×D412yes—
329C2×C4×C5C22×D412yes—
330C2×C4×C5C22×D412yes—
331C2×C4×C5C22×D411yescharacteristic
332C2×C4×C5H(5,𝔽2)14yes—
333C2×C4×C5C2511yescharacteristic
334C22⋊D5—48no—
335C22⋊D5—48no—
336C22⋊D5—48no—
337C2×Dic5—22no—
338C2×Dic5—22no—
339C2×Dic5—22no—
340C2×Dic5—42no—
341C2×Dic5—42no—
342C2×Dic5—42no—
343D20—24no—
344D20—42no—
345C4×D5—48no—
346Dic10—24no—
347Dic10—42no—
348#168—24no—
349#168—24no—
350C25C22⋊D511yescharacteristic
351C2×#41—54no—
352C2×#41—102no—
353C2×#41—204no—
354C22×Q8—22no—
355C22×Q8—21no—
356C22×Q8—44no—
357C22×Q8—51no—
358C22×Q8C22×D512yes—
359C22×Q8C22×D514yes—
360C22×D4—51no—
361C22×D4—101no—
362C22×D4—101no—
363C22×D4—101no—
364C23×C4—21no—
365C23×C4—21no—
366C23×C4—44no—
367C23×C4—101no—
368C23×C4C22⋊D511yescharacteristic
369C23×C4C22⋊D511yescharacteristic
370C23×C4C22⋊D511yescharacteristic
371C23×C4C22⋊D514yes—
372C23×C4C22×D511yescharacteristic
373C23×C4C22×D511yescharacteristic
374C23×C4C22×D511yescharacteristic
375C23×C4C22×D514yes—
376C2×Q16—58no—
377C2×Q16—204no—
378C2×SD16—58no—
379C2×SD16—204no—
380C22×C8—52no—
381C22×C8—52no—
382C22×C8—58no—
383C22×C8—204no—
384#123—108no—
385C22⋊Q8—24no—
386C22⋊Q8—24no—
387C22⋊Q8—28no—
388C22⋊Q8—28no—
389C22⋊Q8—54no—
390C22⋊Q8—54no—
391C22⋊Q8—102no—
392C22⋊Q8—102no—
393C22⋊Q8C22×D518yes—
394C22⋊Q8C22×D518yes—
395#121—54no—
396#121—54no—
397#121—102no—
398#121—102no—
399#120—108no—
400C4×D4—108no—
401C4×D4—108no—
402#117—54no—
403#117—102no—
404C2×C4⋊C4—22no—
405C2×C4⋊C4—22no—
406C2×C4⋊C4—28no—
407C2×C4⋊C4—22no—
408C2×C4⋊C4—21no—
409C2×C4⋊C4—51no—
410C2×C4⋊C4—51no—
411C2×C4⋊C4—101no—
412C2×C4⋊C4—101no—
413C2×C4⋊C4C22×D512yes—
414C2×C4⋊C4C22×D514yes—
415C2×C22⋊C4—22no—
416C2×C22⋊C4—22no—
417C2×C22⋊C4—28no—
418C2×C22⋊C4—101no—
419C2×C22⋊C4—101no—
420C2×C22⋊C4—101no—
421C2×C22⋊C4—101no—
422C2×C22⋊C4—101no—
423C2×C42—101no—
424#107—58no—
425#106—58no—
426#103—58no—
427#103—58no—
428#103—58no—
429#102—58no—
430C22⋊C8—54no—
431C22⋊C8—54no—
432C22⋊C8—58no—
433C22×C5—22no—
434C22×C5—22no—
435C22×C5—28no—
436C22×C5—28no—
437C22×C5—22no—
438C22×C5—22no—
439C22×C5—22no—
440C22×C5—22no—
441C22×C5—22no—
442C22×C5—416no—
443C22×C5—44no—
444C22×C5#53412yes—
445C22×C5C2×#13514yes—
446C22×C5C2×#13512yes—
447C22×C5C2×#13714yes—
448C22×C5C2×#13712yes—
449C22×C5C23×D411yescharacteristic
450C2×D5—42no—
451C2×D5—42no—
452C2×D5—42no—
453C2×D5—84no—
454C4×C5—22no—
455C4×C5—22no—
456C4×C5—22no—
457C4×C5—44no—
458C4×C5—44no—
459C4×C5#53412yes—
460C4×C5C2×H(5,𝔽2)12yes—
461Dic5—42no—
462Dic5—42no—
463Dic5—42no—
464C24—24no—
465C24—24no—
466C24—42no—
467C24—101no—
468C24C2×C22⋊D511yescharacteristic
469C24C2×C22⋊D514yes—
470C24C2×C22⋊D511yescharacteristic
471C24C2×C22⋊D511yescharacteristic
472#41—208no—
473#41—208no—
474C2×Q8—24no—
475C2×Q8—22no—
476C2×Q8—24no—
477C2×Q8—24no—
478C2×Q8—48no—
479C2×Q8—44no—
480C2×Q8—48no—
481C2×Q8—52no—
482C2×Q8—101no—
483C2×Q8—104no—
484C2×Q8C23×D514yes—
485C2×D4—52no—
486C2×D4—104no—
487C2×D4—104no—
488C2×D4—104no—
489C2×D4—104no—
490C2×D4—101no—
491C2×D4—204no—
492C2×D4—204no—
493C2×D4—204no—
494C22×C4—24no—
495C22×C4—24no—
496C22×C4—24no—
497C22×C4—24no—
498C22×C4—24no—
499C22×C4—22no—
500C22×C4—22no—
501C22×C4—48no—
502C22×C4—48no—
503C22×C4—42no—
504C22×C4—42no—
505C22×C4—42no—
506C22×C4—44no—
507C22×C4—44no—
508C22×C4—101no—
509C22×C4—101no—
510C22×C4—101no—
511C22×C4—104no—
512C22×C4—204no—
513C22×C4C2×C22⋊D512yes—
514C22×C4C2×C22⋊D512yes—
515C22×C4C2×C22⋊D512yes—
516C22×C4C2×C22⋊D511yescharacteristic
517C22×C4C2×C22⋊D511yescharacteristic
518C22×C4C2×C22⋊D511yescharacteristic
519C22×C4C2×C22⋊D514yes—
520C22×C4C2×C22⋊D514yes—
521C22×C4C2×C22⋊D514yes—
522C22×C4C23×D512yes—
523C22×C4C23×D512yes—
524C22×C4C23×D512yes—
525C22×C4C23×D511yescharacteristic
526Q16—208no—
527SD16—208no—
528C2×C8—54no—
529C2×C8—54no—
530C2×C8—104no—
531C2×C8—104no—
532C2×C8—208no—
533C4⋊C4—28no—
534C4⋊C4—28no—
535C4⋊C4—24no—
536C4⋊C4—22no—
537C4⋊C4—52no—
538C4⋊C4—52no—
539C4⋊C4—101no—
540C4⋊C4—101no—
541C4⋊C4—104no—
542C4⋊C4—104no—
543C4⋊C4C23×D514yes—
544C22⋊C4—28no—
545C22⋊C4—28no—
546C22⋊C4—104no—
547C22⋊C4—104no—
548C22⋊C4—104no—
549C22⋊C4—104no—
550C22⋊C4—104no—
551C42—104no—
552C2×C5—24no—
553C2×C5—24no—
554C2×C5—42no—
555C2×C5#319014yescomplemented
556C2×C5C2×#53411yescharacteristic
557C2×C5C22×#13511yescharacteristic
558C2×C5C22×#13711yescharacteristic
559D5—82no—
560C23—22no—
561C23—22no—
562C23—22no—
563C23—22no—
564C23—22no—
565C23—28no—
566C23—22no—
567C23—28no—
568C23—22no—
569C23—44no—
570C23—416no—
571C23—102no—
572C23—202no—
573C23—202no—
574C23—202no—
575C23#408814yes—
576C23#409614yes—
577C23C22×C22⋊D512yes—
578C23C22×C22⋊D512yes—
579C23C22×C22⋊D512yes—
580C23C22×C22⋊D511yescharacteristic
581Q8—24no—
582Q8—24no—
583Q8—48no—
584Q8—44no—
585Q8—104no—
586Q8—202no—
587D4—104no—
588D4—208no—
589D4—208no—
590D4—208no—
591D4—202no—
592C2×C4—22no—
593C2×C4—22no—
594C2×C4—22no—
595C2×C4—24no—
596C2×C4—24no—
597C2×C4—24no—
598C2×C4—24no—
599C2×C4—24no—
600C2×C4—24no—
601C2×C4—24no—
602C2×C4—24no—
603C2×C4—44no—
604C2×C4—44no—
605C2×C4—44no—
606C2×C4—48no—
607C2×C4—44no—
608C2×C4—48no—
609C2×C4—44no—
610C2×C4—102no—
611C2×C4—102no—
612C2×C4—102no—
613C2×C4—208no—
614C2×C4—202no—
615C2×C4—202no—
616C2×C4—202no—
617C2×C4#414414yes—
618C2×C4C22×C22⋊D512yes—
619C2×C4C22×C22⋊D512yes—
620C2×C4C22×C22⋊D512yes—
621C2×C4C22×C22⋊D511yescharacteristic
622C2×C4C24×D511yescharacteristic
623C8—104no—
624C8—104no—
625C5C2×#319011yescharacteristic, complemented, Sylow
626C22—22no—
627C22—22no—
628C22—22no—
629C22—22no—
630C22—28no—
631C22—28no—
632C22—22no—
633C22—22no—
634C22—22no—
635C22—416no—
636C22—44no—
637C22—202no—
638C22—202no—
639C22—202no—
640C22—404no—
641C22#6613812yes—
642C22C2×#408814yes—
643C22C2×#408812yes—
644C22C2×#409614yes—
645C22C2×#409612yes—
646C22C23×C22⋊D511yescharacteristic
647C4—22no—
648C4—22no—
649C4—22no—
650C4—44no—
651C4—44no—
652C4—202no—
653C4—202no—
654C4—202no—
655C4#6613812yes—
656C4C2×#414412yes—
657C2—24no—
658C2—24no—
659C2—42no—
660C2—402no—
661C2#1061446814yesdirect product factor
662C2C2×#6613811yescharacteristic
663C2C22×#408811yescharacteristic
664C2C22×#409611yescharacteristic
subgroupG/H
centerC23C22×C22⋊D5
commutator, cosocleC2×C4×C5C25
FrattiniC2×C4C24×D5
FittingC22×C5×C22⋊Q8C2
socleC23×C5C22×D4
prime radicalC2×#66125C2
hypercenterC22×C22⋊Q8D5
hypocenterC5C2×#3190
LCSG ▷ C2×C4×C5 ▷ C2×C5 ▷ C5
UCSC1 ◁ C23 ◁ C24×C4 ◁ C22×C22⋊Q8

Complements

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

NH ≅ G/Ntype
1. C22×C5×C22⋊Q8C2semidirect
3. C2×#65517C2semidirect
4. C2×#65516C2semidirect
5. C22×C22⋊#168C2semidirect
6. #10614468C2direct (N × H)
7. C2×#65336C2semidirect
8. C2×#65340C2semidirect
9. C2×#65337C2semidirect
10. C2×#65334C2semidirect
11. C2×#65260C2semidirect
12. C2×#65256C2semidirect
21. C2×C5×C22⋊Q8C22semidirect
26. C22×#689C22semidirect
27. C22×#688C22semidirect
39. #65517C22semidirect
40. #65516C22semidirect
41. C2×#3967C22semidirect
42. C2×#3967C22semidirect
46. C2×C22⋊#168C22semidirect
47. #65340C22semidirect
48. #65337C22semidirect
49. #65336C22semidirect
50. #65334C22semidirect
51. #65260C22semidirect
52. C2×#3942C22semidirect
53. #65256C22semidirect
54. C2×#3941C22semidirect
55. C2×#3940C22semidirect
56. C2×#3939C22semidirect
105. C2×#689C23semidirect
107. C2×#688C23semidirect
132. #3967C23semidirect
133. #3967C23semidirect
137. #3942C23semidirect
138. #3941C23semidirect
139. #3940C23semidirect
140. #3939C23semidirect
142. C22×C22⋊Q8D5semidirect
257. C2×C22⋊Q8C2×D5semidirect
555. C2×C5#3190semidirect
625. C5C2×#3190semidirect
661. C2#10614468direct (N × H)

Maximal subgroups

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

subgroupindex
C22×C5×C22⋊Q82
C2×#661252
C2×#655172
C2×#655162
C22×C22⋊#1682
#106144682
C2×#653362
C2×#653402
C2×#653372
C2×#653342
C2×#652602
C2×#652562
C2×#31905