A260758 - cp's OEIS frontend

A260758 Least k > 0 such that M(n)^2 + 2k is prime, where M(n) = 2^n - 1 = A000225(n).

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	3
6	10
7	5
8	1
9	3
10	14
11	11
12	4
13	5
14	4
15	5
16	8
17	30
18	2
19	6
20	1
21	8
22	29
23	12
24	29
25	30
26	11
27	2
28	4
29	5
30	19
31	29
32	2
33	9
34	7
35	11
36	4
37	74
38	16
39	24
40	8
41	18
42	10
43	30
44	56
45	15
46	35
47	24
48	4
49	35
50	19
51	111
52	19
53	18
54	1
55	57
56	8
57	20
58	14
59	2
60	2
61	48
62	29
63	26
64	92
65	24
66	19
67	155
68	2
69	78
70	35
71	56
72	113
73	33
74	70
75	32
76	7

[1, 1, 1, 2, 1, 3, 10, 5, 1, 3, 14, 11, 4, 5, 4, 5, 8, 30, 2, 6, 1, 8, 29, 12, 29, 30, 11, 2, 4, 5, 19, 29, 2, 9, 7, 11, 4, 74, 16, 24, 8, 18, 10, 30, 56, 15, 35, 24, 4, 35, 19, 111, 19, 18, 1, 57, 8, 20, 14, 2, 2, 48, 29, 26, 92, 24, 19, 155, 2, 78, 35, 56, 113, 33, 70, 32, 7]

cp's OEIS Frontend

A260758 Least k > 0 such that M(n)^2 + 2k is prime, where M(n) = 2^n - 1 = A000225(n).

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	3
6	10
7	5
8	1
9	3
10	14
11	11
12	4
13	5
14	4
15	5
16	8
17	30
18	2
19	6
20	1
21	8
22	29
23	12
24	29
25	30
26	11
27	2
28	4
29	5
30	19
31	29
32	2
33	9
34	7
35	11
36	4
37	74
38	16
39	24
40	8
41	18
42	10
43	30
44	56
45	15
46	35
47	24
48	4
49	35
50	19
51	111
52	19
53	18
54	1
55	57
56	8
57	20
58	14
59	2
60	2
61	48
62	29
63	26
64	92
65	24
66	19
67	155
68	2
69	78
70	35
71	56
72	113
73	33
74	70
75	32
76	7

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	3
6	10
7	5
8	1
9	3
10	14
11	11
12	4
13	5
14	4
15	5
16	8
17	30
18	2
19	6
20	1
21	8
22	29
23	12
24	29
25	30
26	11
27	2
28	4
29	5
30	19
31	29
32	2
33	9
34	7
35	11
36	4
37	74
38	16
39	24
40	8
41	18
42	10
43	30
44	56
45	15
46	35
47	24
48	4
49	35
50	19
51	111
52	19
53	18
54	1
55	57
56	8
57	20
58	14
59	2
60	2
61	48
62	29
63	26
64	92
65	24
66	19
67	155
68	2
69	78
70	35
71	56
72	113
73	33
74	70
75	32
76	7

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	3
6	10
7	5
8	1
9	3
10	14
11	11
12	4
13	5
14	4
15	5
16	8
17	30
18	2
19	6
20	1
21	8
22	29
23	12
24	29
25	30
26	11
27	2
28	4
29	5
30	19
31	29
32	2
33	9
34	7
35	11
36	4
37	74
38	16
39	24
40	8
41	18
42	10
43	30
44	56
45	15
46	35
47	24
48	4
49	35
50	19
51	111
52	19
53	18
54	1
55	57
56	8
57	20
58	14
59	2
60	2
61	48
62	29
63	26
64	92
65	24
66	19
67	155
68	2
69	78
70	35
71	56
72	113
73	33
74	70
75	32
76	7