A360105 - cp's OEIS frontend

A360105 Numbers k such that sigma_2(k^2 + 1) == 0 (mod k).

n	a(n)
1	1
2	2
3	5
4	7
5	13
6	25
7	34
8	52
9	89
10	93
11	100
12	200
13	233
14	338
15	610
16	850
17	915
18	1028
19	1352
20	1508
21	1918
22	2105
23	3918
24	4181
25	5540
26	6396
27	6728
28	7250
29	9282
30	10100
31	10132
32	10946
33	15507
34	16609
35	17125
36	32708
37	32776
38	37107
39	42568
40	47770
41	58218
42	61230
43	72125
44	74948
45	75025
46	78608

[1, 2, 5, 7, 13, 25, 34, 52, 89, 93, 100, 200, 233, 338, 610, 850, 915, 1028, 1352, 1508, 1918, 2105, 3918, 4181, 5540, 6396, 6728, 7250, 9282, 10100, 10132, 10946, 15507, 16609, 17125, 32708, 32776, 37107, 42568, 47770, 58218, 61230, 72125, 74948, 75025, 78608]

cp's OEIS Frontend

A360105 Numbers k such that sigma_2(k^2 + 1) == 0 (mod k).

Table of values

List of values