A267288 - cp's OEIS frontend

A267288 Composites c where at least one base b with 1 < b < c exists such that b^(c-1) == 1 (mod c^2), i.e., composites c that are base-b 'Wieferich pseudoprimes' for at least one b between 1 and c.

n	a(n)
1	133
2	451
3	561
4	871
5	904
6	1065
7	1105
8	1267
9	1729
10	1891
11	2059
12	2201
13	2501
14	2821
15	2993
16	3145
17	4641
18	5005
19	5551
20	5841
21	5963
22	6409
23	6541
24	6601
25	6697
26	7107
27	7471
28	7501
29	8321
30	8323
31	9637
32	10585
33	11266
34	12209
35	12403
36	13571
37	13585
38	16471
39	17261
40	17466
41	17770
42	18103

[133, 451, 561, 871, 904, 1065, 1105, 1267, 1729, 1891, 2059, 2201, 2501, 2821, 2993, 3145, 4641, 5005, 5551, 5841, 5963, 6409, 6541, 6601, 6697, 7107, 7471, 7501, 8321, 8323, 9637, 10585, 11266, 12209, 12403, 13571, 13585, 16471, 17261, 17466, 17770, 18103]

cp's OEIS Frontend

A267288 Composites c where at least one base b with 1 < b < c exists such that b^(c-1) == 1 (mod c^2), i.e., composites c that are base-b 'Wieferich pseudoprimes' for at least one b between 1 and c.

Table of values

List of values