A317556 - cp's OEIS frontend

A317556 a(n) is the smallest composite k such that k divides 2^(k*n-1) - 1.

n	a(n)
1	341
2	80519
3	15
4	511
5	65
6	42671
7	15
8	161
9	445
10	35551
11	15
12	2047
13	85
14	80129
15	15
16	1561
17	33
18	190679
19	15
20	983927
21	85
22	511
23	15
24	11303
25	345
26	2201
27	15
28	217
29	65
30	188393
31	15
32	39071
33	129
34	2047
35	15
36	8727391
37	33
38	63457
39	15
40	511
41	65
42	2417783
43	15
44	64759
45	85
46	2921
47	15
48	1898777
49	133
50	119063
51	15
52	2263
53	65
54	10097

[341, 80519, 15, 511, 65, 42671, 15, 161, 445, 35551, 15, 2047, 85, 80129, 15, 1561, 33, 190679, 15, 983927, 85, 511, 15, 11303, 345, 2201, 15, 217, 65, 188393, 15, 39071, 129, 2047, 15, 8727391, 33, 63457, 15, 511, 65, 2417783, 15, 64759, 85, 2921, 15, 1898777, 133, 119063, 15, 2263, 65, 10097]

cp's OEIS Frontend

A317556 a(n) is the smallest composite k such that k divides 2^(k*n-1) - 1.

Table of values

List of values