A269264 - cp's OEIS frontend

A269264 Numbers k such that (2^k-1)^2 - 2 is a semiprime.

n	a(n)
1	5
2	9
3	13
4	16
5	23
6	24
7	28
8	35
9	37
10	38
11	40
12	47
13	48
14	51
15	52
16	57
17	61
18	65
19	67
20	70
21	79
22	83
23	84
24	85
25	88
26	90
27	102
28	111
29	144
30	148
31	157
32	162
33	168
34	169
35	177
36	181
37	190
38	237
39	246
40	298
41	308
42	346

[5, 9, 13, 16, 23, 24, 28, 35, 37, 38, 40, 47, 48, 51, 52, 57, 61, 65, 67, 70, 79, 83, 84, 85, 88, 90, 102, 111, 144, 148, 157, 162, 168, 169, 177, 181, 190, 237, 246, 298, 308, 346]

cp's OEIS Frontend

A269264 Numbers k such that (2^k-1)^2 - 2 is a semiprime.

Table of values

List of values

n	a(n)
1	5
2	9
3	13
4	16
5	23
6	24
7	28
8	35
9	37
10	38
11	40
12	47
13	48
14	51
15	52
16	57
17	61
18	65
19	67
20	70
21	79
22	83
23	84
24	85
25	88
26	90
27	102
28	111
29	144
30	148
31	157
32	162
33	168
34	169
35	177
36	181
37	190
38	237
39	246
40	298
41	308
42	346

n	a(n)
1	5
2	9
3	13
4	16
5	23
6	24
7	28
8	35
9	37
10	38
11	40
12	47
13	48
14	51
15	52
16	57
17	61
18	65
19	67
20	70
21	79
22	83
23	84
24	85
25	88
26	90
27	102
28	111
29	144
30	148
31	157
32	162
33	168
34	169
35	177
36	181
37	190
38	237
39	246
40	298
41	308
42	346

n	a(n)
1	5
2	9
3	13
4	16
5	23
6	24
7	28
8	35
9	37
10	38
11	40
12	47
13	48
14	51
15	52
16	57
17	61
18	65
19	67
20	70
21	79
22	83
23	84
24	85
25	88
26	90
27	102
28	111
29	144
30	148
31	157
32	162
33	168
34	169
35	177
36	181
37	190
38	237
39	246
40	298
41	308
42	346