A191751 - cp's OEIS frontend

A191751 Least k such that (2^n-1)*2^n - k is a prime number.

n	a(n)
1	0
2	1
3	3
4	1
5	1
6	5
7	3
8	11
9	1
10	1
11	25
12	29
13	3
14	13
15	3
16	7
17	39
18	1
19	13
20	23
21	3
22	5
23	69
24	11
25	39
26	13
27	15
28	31
29	99
30	83
31	117
32	31
33	9
34	11
35	25
36	67
37	45
38	1
39	39
40	47
41	45
42	71
43	69
44	77
45	1
46	131
47	67
48	101
49	55
50	1
51	9
52	41
53	13
54	43
55	33
56	233
57	1
58	113
59	7
60	29
61	45
62	55
63	99
64	41
65	261
66	5
67	15
68	343
69	9

[0, 1, 3, 1, 1, 5, 3, 11, 1, 1, 25, 29, 3, 13, 3, 7, 39, 1, 13, 23, 3, 5, 69, 11, 39, 13, 15, 31, 99, 83, 117, 31, 9, 11, 25, 67, 45, 1, 39, 47, 45, 71, 69, 77, 1, 131, 67, 101, 55, 1, 9, 41, 13, 43, 33, 233, 1, 113, 7, 29, 45, 55, 99, 41, 261, 5, 15, 343, 9]

cp's OEIS Frontend

A191751 Least k such that (2^n-1)*2^n - k is a prime number.

Table of values

List of values

n	a(n)
1	0
2	1
3	3
4	1
5	1
6	5
7	3
8	11
9	1
10	1
11	25
12	29
13	3
14	13
15	3
16	7
17	39
18	1
19	13
20	23
21	3
22	5
23	69
24	11
25	39
26	13
27	15
28	31
29	99
30	83
31	117
32	31
33	9
34	11
35	25
36	67
37	45
38	1
39	39
40	47
41	45
42	71
43	69
44	77
45	1
46	131
47	67
48	101
49	55
50	1
51	9
52	41
53	13
54	43
55	33
56	233
57	1
58	113
59	7
60	29
61	45
62	55
63	99
64	41
65	261
66	5
67	15
68	343
69	9

n	a(n)
1	0
2	1
3	3
4	1
5	1
6	5
7	3
8	11
9	1
10	1
11	25
12	29
13	3
14	13
15	3
16	7
17	39
18	1
19	13
20	23
21	3
22	5
23	69
24	11
25	39
26	13
27	15
28	31
29	99
30	83
31	117
32	31
33	9
34	11
35	25
36	67
37	45
38	1
39	39
40	47
41	45
42	71
43	69
44	77
45	1
46	131
47	67
48	101
49	55
50	1
51	9
52	41
53	13
54	43
55	33
56	233
57	1
58	113
59	7
60	29
61	45
62	55
63	99
64	41
65	261
66	5
67	15
68	343
69	9

n	a(n)
1	0
2	1
3	3
4	1
5	1
6	5
7	3
8	11
9	1
10	1
11	25
12	29
13	3
14	13
15	3
16	7
17	39
18	1
19	13
20	23
21	3
22	5
23	69
24	11
25	39
26	13
27	15
28	31
29	99
30	83
31	117
32	31
33	9
34	11
35	25
36	67
37	45
38	1
39	39
40	47
41	45
42	71
43	69
44	77
45	1
46	131
47	67
48	101
49	55
50	1
51	9
52	41
53	13
54	43
55	33
56	233
57	1
58	113
59	7
60	29
61	45
62	55
63	99
64	41
65	261
66	5
67	15
68	343
69	9