A337811 - cp's OEIS frontend

A337811 Numbers k such that the number of distinct prime factors of 2^k - 1 is less than the corresponding count for 2^k + 1.

n	a(n)
1	1
2	5
3	7
4	13
5	17
6	19
7	25
8	26
9	31
10	34
11	35
12	37
13	38
14	41
15	46
16	49
17	59
18	61
19	62
20	65
21	67
22	77
23	78
24	83
25	85
26	89
27	91
28	93
29	97
30	98
31	103
32	107
33	109
34	118
35	122
36	123
37	125
38	127
39	131
40	133
41	134
42	137
43	139
44	143
45	145
46	147
47	149
48	153
49	157
50	170
51	173
52	175
53	177
54	185
55	186
56	189
57	193
58	194
59	195

[1, 5, 7, 13, 17, 19, 25, 26, 31, 34, 35, 37, 38, 41, 46, 49, 59, 61, 62, 65, 67, 77, 78, 83, 85, 89, 91, 93, 97, 98, 103, 107, 109, 118, 122, 123, 125, 127, 131, 133, 134, 137, 139, 143, 145, 147, 149, 153, 157, 170, 173, 175, 177, 185, 186, 189, 193, 194, 195]

cp's OEIS Frontend

A337811 Numbers k such that the number of distinct prime factors of 2^k - 1 is less than the corresponding count for 2^k + 1.

Table of values

List of values

n	a(n)
1	1
2	5
3	7
4	13
5	17
6	19
7	25
8	26
9	31
10	34
11	35
12	37
13	38
14	41
15	46
16	49
17	59
18	61
19	62
20	65
21	67
22	77
23	78
24	83
25	85
26	89
27	91
28	93
29	97
30	98
31	103
32	107
33	109
34	118
35	122
36	123
37	125
38	127
39	131
40	133
41	134
42	137
43	139
44	143
45	145
46	147
47	149
48	153
49	157
50	170
51	173
52	175
53	177
54	185
55	186
56	189
57	193
58	194
59	195

n	a(n)
1	1
2	5
3	7
4	13
5	17
6	19
7	25
8	26
9	31
10	34
11	35
12	37
13	38
14	41
15	46
16	49
17	59
18	61
19	62
20	65
21	67
22	77
23	78
24	83
25	85
26	89
27	91
28	93
29	97
30	98
31	103
32	107
33	109
34	118
35	122
36	123
37	125
38	127
39	131
40	133
41	134
42	137
43	139
44	143
45	145
46	147
47	149
48	153
49	157
50	170
51	173
52	175
53	177
54	185
55	186
56	189
57	193
58	194
59	195

n	a(n)
1	1
2	5
3	7
4	13
5	17
6	19
7	25
8	26
9	31
10	34
11	35
12	37
13	38
14	41
15	46
16	49
17	59
18	61
19	62
20	65
21	67
22	77
23	78
24	83
25	85
26	89
27	91
28	93
29	97
30	98
31	103
32	107
33	109
34	118
35	122
36	123
37	125
38	127
39	131
40	133
41	134
42	137
43	139
44	143
45	145
46	147
47	149
48	153
49	157
50	170
51	173
52	175
53	177
54	185
55	186
56	189
57	193
58	194
59	195