A331204 - cp's OEIS frontend

A331204 Least m > n such that 2^m - 2^n + 1 is prime.

n	a(n)
0	1
1	2
2	3
3	39
4	5
5	7
6	8
7	47
8	9
9	13
10	14
11	27
12	14
13	23
14	17
15	447
16	17
17	23
18	20
19	31
20	23
21	27
22	34
23	39
24	31
25	31
26	29
27	31
28	43
29	41
30	32
31	191
32	40
33	43
34	49
35	59
36	38
37	41
38	42
39	255
40	64
41	43
42	65
43	331
44	48
45	59
46	62
47	111
48	52
49	79
50	53
51	91
52	55
53	75
54	61
55	199
56	71
57	65
58	86
59	99
60	65
61	127
62	74

[1, 2, 3, 39, 5, 7, 8, 47, 9, 13, 14, 27, 14, 23, 17, 447, 17, 23, 20, 31, 23, 27, 34, 39, 31, 31, 29, 31, 43, 41, 32, 191, 40, 43, 49, 59, 38, 41, 42, 255, 64, 43, 65, 331, 48, 59, 62, 111, 52, 79, 53, 91, 55, 75, 61, 199, 71, 65, 86, 99, 65, 127, 74]

cp's OEIS Frontend

A331204 Least m > n such that 2^m - 2^n + 1 is prime.

Table of values

List of values

n	a(n)
0	1
1	2
2	3
3	39
4	5
5	7
6	8
7	47
8	9
9	13
10	14
11	27
12	14
13	23
14	17
15	447
16	17
17	23
18	20
19	31
20	23
21	27
22	34
23	39
24	31
25	31
26	29
27	31
28	43
29	41
30	32
31	191
32	40
33	43
34	49
35	59
36	38
37	41
38	42
39	255
40	64
41	43
42	65
43	331
44	48
45	59
46	62
47	111
48	52
49	79
50	53
51	91
52	55
53	75
54	61
55	199
56	71
57	65
58	86
59	99
60	65
61	127
62	74

n	a(n)
0	1
1	2
2	3
3	39
4	5
5	7
6	8
7	47
8	9
9	13
10	14
11	27
12	14
13	23
14	17
15	447
16	17
17	23
18	20
19	31
20	23
21	27
22	34
23	39
24	31
25	31
26	29
27	31
28	43
29	41
30	32
31	191
32	40
33	43
34	49
35	59
36	38
37	41
38	42
39	255
40	64
41	43
42	65
43	331
44	48
45	59
46	62
47	111
48	52
49	79
50	53
51	91
52	55
53	75
54	61
55	199
56	71
57	65
58	86
59	99
60	65
61	127
62	74

n	a(n)
0	1
1	2
2	3
3	39
4	5
5	7
6	8
7	47
8	9
9	13
10	14
11	27
12	14
13	23
14	17
15	447
16	17
17	23
18	20
19	31
20	23
21	27
22	34
23	39
24	31
25	31
26	29
27	31
28	43
29	41
30	32
31	191
32	40
33	43
34	49
35	59
36	38
37	41
38	42
39	255
40	64
41	43
42	65
43	331
44	48
45	59
46	62
47	111
48	52
49	79
50	53
51	91
52	55
53	75
54	61
55	199
56	71
57	65
58	86
59	99
60	65
61	127
62	74