A176033 - cp's OEIS frontend

A176033 Numbers k such that 2^(2k-1) == 2 (mod 2k) and such that 2^(k-1) != 1 (mod k).

n	a(n)
1	15
2	85
3	91
4	435
5	451
6	703
7	1247
8	1271
9	1581
10	1695
11	1891
12	2071
13	3133
14	3367
15	3683
16	4795
17	4859
18	5551
19	6643
20	8695
21	9061
22	9131
23	9211
24	9605
25	9919
26	12403
27	13019
28	14351
29	14701
30	15051
31	15211
32	16021
33	16471
34	19669
35	20191
36	20485
37	24727
38	25351
39	26335
40	26599
41	27511
42	28645

[15, 85, 91, 435, 451, 703, 1247, 1271, 1581, 1695, 1891, 2071, 3133, 3367, 3683, 4795, 4859, 5551, 6643, 8695, 9061, 9131, 9211, 9605, 9919, 12403, 13019, 14351, 14701, 15051, 15211, 16021, 16471, 19669, 20191, 20485, 24727, 25351, 26335, 26599, 27511, 28645]

cp's OEIS Frontend

A176033 Numbers k such that 2^(2k-1) == 2 (mod 2k) and such that 2^(k-1) != 1 (mod k).

Table of values

List of values