A127643 - cp's OEIS frontend

A127643 Composite numbers k that divide A123591(k) = ((2^k - 1)^(2^k) - 1)/(2^k)^2.

n	a(n)
1	15
2	51
3	65
4	85
5	185
6	221
7	255
8	341
9	451
10	533
11	561
12	595
13	645
14	679
15	771
16	1059
17	1095
18	1105
19	1271
20	1285
21	1313
22	1387
23	1455
24	1581
25	1729
26	1905
27	2045
28	2047
29	2091
30	2307
31	2465
32	2701
33	2755
34	2821
35	2895
36	3201
37	3205
38	3277
39	3281
40	3341
41	3603
42	3655
43	3723
44	3855
45	4033
46	4039

[15, 51, 65, 85, 185, 221, 255, 341, 451, 533, 561, 595, 645, 679, 771, 1059, 1095, 1105, 1271, 1285, 1313, 1387, 1455, 1581, 1729, 1905, 2045, 2047, 2091, 2307, 2465, 2701, 2755, 2821, 2895, 3201, 3205, 3277, 3281, 3341, 3603, 3655, 3723, 3855, 4033, 4039]

cp's OEIS Frontend

A127643 Composite numbers k that divide A123591(k) = ((2^k - 1)^(2^k) - 1)/(2^k)^2.

Table of values

List of values