A156787 - cp's OEIS frontend

A156787 Composite integers n such that 2^{n-1}=1 mod s(n), where s(n) is the sum of the distinct prime factors of n.

n	a(n)
1	9
2	10
3	25
4	27
5	40
6	49
7	81
8	100
9	105
10	116
11	121
12	125
13	160
14	169
15	243
16	250
17	289
18	343
19	361
20	400
21	525
22	529
23	561
24	568
25	625
26	640
27	729
28	805
29	841
30	945
31	961
32	1000
33	1001
34	1018
35	1045
36	1105
37	1309
38	1331
39	1369
40	1596
41	1600
42	1681
43	1729
44	1849
45	1856
46	1881
47	2001
48	2187
49	2197
50	2205

[9, 10, 25, 27, 40, 49, 81, 100, 105, 116, 121, 125, 160, 169, 243, 250, 289, 343, 361, 400, 525, 529, 561, 568, 625, 640, 729, 805, 841, 945, 961, 1000, 1001, 1018, 1045, 1105, 1309, 1331, 1369, 1596, 1600, 1681, 1729, 1849, 1856, 1881, 2001, 2187, 2197, 2205]

cp's OEIS Frontend

A156787 Composite integers n such that 2^{n-1}=1 mod s(n), where s(n) is the sum of the distinct prime factors of n.

Table of values

List of values