A187965 - cp's OEIS frontend

A187965 Numbers k such that 2^k - 1 and 2^k + 1 are not squarefree.

n	a(n)
1	21
2	30
3	63
4	78
5	90
6	105
7	110
8	147
9	150
10	189
11	204
12	210
13	231
14	234
15	270
16	273
17	310
18	315
19	330
20	340
21	357
22	390
23	399
24	441
25	450
26	465
27	483
28	510
29	525
30	546
31	550
32	567
33	570
34	609
35	612
36	630
37	651
38	657
39	666
40	690
41	693
42	702
43	735
44	750
45	759
46	770
47	777
48	810
49	819
50	858
51	861
52	870
53	903
54	930
55	945
56	987
57	990
58	1014
59	1020
60	1029
61	1050
62	1071

[21, 30, 63, 78, 90, 105, 110, 147, 150, 189, 204, 210, 231, 234, 270, 273, 310, 315, 330, 340, 357, 390, 399, 441, 450, 465, 483, 510, 525, 546, 550, 567, 570, 609, 612, 630, 651, 657, 666, 690, 693, 702, 735, 750, 759, 770, 777, 810, 819, 858, 861, 870, 903, 930, 945, 987, 990, 1014, 1020, 1029, 1050, 1071]

cp's OEIS Frontend

A187965 Numbers k such that 2^k - 1 and 2^k + 1 are not squarefree.

Table of values

List of values