A135979 - cp's OEIS frontend

A135979 Indices n such that 2^prime(n)-1 has exactly 2 distinct prime factors.

n	a(n)
1	5
2	9
3	12
4	13
5	17
6	19
7	23
8	25
9	26
10	27
11	29
12	32
13	33
14	34
15	35
16	39
17	45
18	46
19	49
20	53
21	57
22	58
23	60
24	62
25	69
26	74
27	75
28	82
29	88
30	93
31	99
32	129
33	140
34	152
35	164
36	166
37	168
38	178
39	179

[5, 9, 12, 13, 17, 19, 23, 25, 26, 27, 29, 32, 33, 34, 35, 39, 45, 46, 49, 53, 57, 58, 60, 62, 69, 74, 75, 82, 88, 93, 99, 129, 140, 152, 164, 166, 168, 178, 179]

cp's OEIS Frontend

A135979 Indices n such that 2^prime(n)-1 has exactly 2 distinct prime factors.

Table of values

List of values

n	a(n)
1	5
2	9
3	12
4	13
5	17
6	19
7	23
8	25
9	26
10	27
11	29
12	32
13	33
14	34
15	35
16	39
17	45
18	46
19	49
20	53
21	57
22	58
23	60
24	62
25	69
26	74
27	75
28	82
29	88
30	93
31	99
32	129
33	140
34	152
35	164
36	166
37	168
38	178
39	179

n	a(n)
1	5
2	9
3	12
4	13
5	17
6	19
7	23
8	25
9	26
10	27
11	29
12	32
13	33
14	34
15	35
16	39
17	45
18	46
19	49
20	53
21	57
22	58
23	60
24	62
25	69
26	74
27	75
28	82
29	88
30	93
31	99
32	129
33	140
34	152
35	164
36	166
37	168
38	178
39	179

n	a(n)
1	5
2	9
3	12
4	13
5	17
6	19
7	23
8	25
9	26
10	27
11	29
12	32
13	33
14	34
15	35
16	39
17	45
18	46
19	49
20	53
21	57
22	58
23	60
24	62
25	69
26	74
27	75
28	82
29	88
30	93
31	99
32	129
33	140
34	152
35	164
36	166
37	168
38	178
39	179