A376473 - cp's OEIS frontend

A376473 Numbers k such that 2^(2^(k-1)-1) == 1 (mod k^2) and 2^(k-1) =/= 1 (mod k).

n	a(n)
1	951481
2	2215441
3	28758601
4	81844921
5	1221936841
6	10370479321
7	16287076081
8	26946809137
9	33663998161
10	35094800881
11	134619011281
12	188455112353
13	299226038833
14	314240366881
15	383116075201
16	594981050401
17	1230227375833
18	1572186445201
19	2096189123113
20	2377714473001

[951481, 2215441, 28758601, 81844921, 1221936841, 10370479321, 16287076081, 26946809137, 33663998161, 35094800881, 134619011281, 188455112353, 299226038833, 314240366881, 383116075201, 594981050401, 1230227375833, 1572186445201, 2096189123113, 2377714473001]

cp's OEIS Frontend

A376473 Numbers k such that 2^(2^(k-1)-1) == 1 (mod k^2) and 2^(k-1) =/= 1 (mod k).

Table of values

List of values