A242292 - cp's OEIS frontend

A242292 Least prime divisor of 2^n - n which does not divide any 2^k - k with 0 < k < n, or 1 if such a primitive prime divisor of 2^n - n does not exist.

n	a(n)
1	1
2	2
3	5
4	3
5	1
6	29
7	11
8	31
9	503
10	13
11	7
12	1021
13	8179
14	1637
15	4679
16	1
17	8737
18	131063
19	524269
20	262139
21	2097131
22	349
23	131
24	773
25	271
26	197
27	457
28	1493
29	317
30	17
31	6733
32	73
33	41
34	157109
35	83
36	53
37	1741
38	3329
39	49977801259
40	997
41	149
42	2199023255531
43	61
44	4398046511093
45	3769453

[1, 2, 5, 3, 1, 29, 11, 31, 503, 13, 7, 1021, 8179, 1637, 4679, 1, 8737, 131063, 524269, 262139, 2097131, 349, 131, 773, 271, 197, 457, 1493, 317, 17, 6733, 73, 41, 157109, 83, 53, 1741, 3329, 49977801259, 997, 149, 2199023255531, 61, 4398046511093, 3769453]

cp's OEIS Frontend

A242292 Least prime divisor of 2^n - n which does not divide any 2^k - k with 0 < k < n, or 1 if such a primitive prime divisor of 2^n - n does not exist.

Table of values

List of values