A320425 - cp's OEIS frontend

A320425 Numbers k such that sigma(sigma(k^4)) == 0 (mod k^2).

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	19
7	38
8	76
9	152
10	304
11	608
12	1216
13	1824
14	3744
15	3840
16	4864
17	6400
18	7904
19	11520
20	14592
21	19200
22	21888
23	23712
24	24320
25	25536
26	32768
27	33696
28	34560
29	43776
30	71136
31	72960
32	80640
33	102144
34	103680
35	114688
36	121600
37	134400
38	134784
39	213408
40	218880
41	306432
42	311296
43	364800
44	403200

[1, 2, 4, 8, 16, 19, 38, 76, 152, 304, 608, 1216, 1824, 3744, 3840, 4864, 6400, 7904, 11520, 14592, 19200, 21888, 23712, 24320, 25536, 32768, 33696, 34560, 43776, 71136, 72960, 80640, 102144, 103680, 114688, 121600, 134400, 134784, 213408, 218880, 306432, 311296, 364800, 403200]

cp's OEIS Frontend

A320425 Numbers k such that sigma(sigma(k^4)) == 0 (mod k^2).

Table of values

List of values