A297362 - cp's OEIS frontend

A297362 Numbers k such that (2^ord(2, k) - 1)/k is prime, where ord(2, k) is the multiplicative order of 2 (mod k).

n	a(n)
1	5
2	9
3	21
4	23
5	33
6	47
7	51
8	73
9	85
10	89
11	93
12	129
13	167
14	217
15	223
16	263
17	315
18	341
19	381
20	585
21	819
22	1057
23	1365
24	3591
25	3855
26	4681
27	4871
28	5461
29	6141
30	6223
31	6719
32	7487
33	8193
34	11447
35	13107
36	13367
37	13797
38	14329
39	16513
40	18631
41	21845
42	24573
43	25575
44	26431
45	33825
46	37449

[5, 9, 21, 23, 33, 47, 51, 73, 85, 89, 93, 129, 167, 217, 223, 263, 315, 341, 381, 585, 819, 1057, 1365, 3591, 3855, 4681, 4871, 5461, 6141, 6223, 6719, 7487, 8193, 11447, 13107, 13367, 13797, 14329, 16513, 18631, 21845, 24573, 25575, 26431, 33825, 37449]

cp's OEIS Frontend

A297362 Numbers k such that (2^ord(2, k) - 1)/k is prime, where ord(2, k) is the multiplicative order of 2 (mod k).

Table of values

List of values