A067758 - cp's OEIS frontend

A067758 Numbers k such that sigma(prime(k) - 1) == 0 (mod k).

n	a(n)
1	1
2	4
3	9
4	27
5	42
6	60
7	64
8	70
9	78
10	144
11	168
12	180
13	216
14	238
15	260
16	318
17	558
18	600
19	672
20	960
21	1008
22	1053
23	1260
24	1620
25	1806
26	2112
27	3318
28	3780
29	4608
30	5544
31	12152
32	40084
33	40095
34	41664
35	47040
36	48825
37	49176
38	51870
39	59832
40	60528
41	71040
42	99008
43	100356
44	113904
45	132000
46	159000

[1, 4, 9, 27, 42, 60, 64, 70, 78, 144, 168, 180, 216, 238, 260, 318, 558, 600, 672, 960, 1008, 1053, 1260, 1620, 1806, 2112, 3318, 3780, 4608, 5544, 12152, 40084, 40095, 41664, 47040, 48825, 49176, 51870, 59832, 60528, 71040, 99008, 100356, 113904, 132000, 159000]

cp's OEIS Frontend

A067758 Numbers k such that sigma(prime(k) - 1) == 0 (mod k).

Table of values

List of values