A002184 - cp's OEIS frontend

A002184 a(n) = least primitive factor of 2^(2n+1) - 1.

n	a(n)
0	1
1	7
2	31
3	127
4	73
5	23
6	8191
7	151
8	131071
9	524287
10	337
11	47
12	601
13	262657
14	233
15	2147483647
16	599479
17	71
18	223
19	79
20	13367
21	431
22	631
23	2351
24	4432676798593
25	103
26	6361
27	881
28	32377
29	179951
30	2305843009213693951
31	92737
32	145295143558111
33	193707721
34	10052678938039
35	228479
36	439
37	100801
38	581283643249112959
39	2687
40	2593
41	167

[1, 7, 31, 127, 73, 23, 8191, 151, 131071, 524287, 337, 47, 601, 262657, 233, 2147483647, 599479, 71, 223, 79, 13367, 431, 631, 2351, 4432676798593, 103, 6361, 881, 32377, 179951, 2305843009213693951, 92737, 145295143558111, 193707721, 10052678938039, 228479, 439, 100801, 581283643249112959, 2687, 2593, 167]

cp's OEIS Frontend

A002184 a(n) = least primitive factor of 2^(2n+1) - 1.

Table of values

List of values