A161508 - cp's OEIS frontend

A161508 Numbers k such that 2^k-1 has only one primitive prime factor.

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	9
8	10
9	12
10	13
11	14
12	15
13	16
14	17
15	18
16	19
17	20
18	21
19	22
20	24
21	26
22	27
23	30
24	31
25	32
26	33
27	34
28	38
29	40
30	42
31	46
32	49
33	54
34	56
35	61
36	62
37	65
38	69
39	77
40	78
41	80
42	85
43	86
44	89
45	90
46	93
47	98
48	107
49	120
50	122
51	126
52	127
53	129
54	133
55	145
56	147
57	150
58	158
59	165
60	170
61	174
62	184
63	192
64	195
65	202
66	208

[2, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 26, 27, 30, 31, 32, 33, 34, 38, 40, 42, 46, 49, 54, 56, 61, 62, 65, 69, 77, 78, 80, 85, 86, 89, 90, 93, 98, 107, 120, 122, 126, 127, 129, 133, 145, 147, 150, 158, 165, 170, 174, 184, 192, 195, 202, 208]

cp's OEIS Frontend

A161508 Numbers k such that 2^k-1 has only one primitive prime factor.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	9
8	10
9	12
10	13
11	14
12	15
13	16
14	17
15	18
16	19
17	20
18	21
19	22
20	24
21	26
22	27
23	30
24	31
25	32
26	33
27	34
28	38
29	40
30	42
31	46
32	49
33	54
34	56
35	61
36	62
37	65
38	69
39	77
40	78
41	80
42	85
43	86
44	89
45	90
46	93
47	98
48	107
49	120
50	122
51	126
52	127
53	129
54	133
55	145
56	147
57	150
58	158
59	165
60	170
61	174
62	184
63	192
64	195
65	202
66	208

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	9
8	10
9	12
10	13
11	14
12	15
13	16
14	17
15	18
16	19
17	20
18	21
19	22
20	24
21	26
22	27
23	30
24	31
25	32
26	33
27	34
28	38
29	40
30	42
31	46
32	49
33	54
34	56
35	61
36	62
37	65
38	69
39	77
40	78
41	80
42	85
43	86
44	89
45	90
46	93
47	98
48	107
49	120
50	122
51	126
52	127
53	129
54	133
55	145
56	147
57	150
58	158
59	165
60	170
61	174
62	184
63	192
64	195
65	202
66	208

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	9
8	10
9	12
10	13
11	14
12	15
13	16
14	17
15	18
16	19
17	20
18	21
19	22
20	24
21	26
22	27
23	30
24	31
25	32
26	33
27	34
28	38
29	40
30	42
31	46
32	49
33	54
34	56
35	61
36	62
37	65
38	69
39	77
40	78
41	80
42	85
43	86
44	89
45	90
46	93
47	98
48	107
49	120
50	122
51	126
52	127
53	129
54	133
55	145
56	147
57	150
58	158
59	165
60	170
61	174
62	184
63	192
64	195
65	202
66	208