A152414 - cp's OEIS frontend

A152414 a(n) = least positive k such that k2^n(2^n-1) - 1 or k2^n(2^n-1) + 1 is prime.

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	3
7	3
8	6
9	1
10	1
11	4
12	2
13	5
14	3
15	9
16	8
17	4
18	1
19	3
20	4
21	36
22	5
23	2
24	4
25	10
26	4
27	18
28	3
29	21
30	9
31	6
32	1
33	6
34	8
35	12
36	2
37	51
38	1
39	2
40	2
41	21
42	6
43	6
44	12
45	1
46	5
47	5
48	3
49	10
50	1
51	11
52	53
53	9
54	4
55	3
56	2
57	1
58	5
59	12
60	10
61	9
62	8
63	5
64	9
65	7
66	6
67	62
68	29
69	16
70	51
71	12
72	3
73	30
74	56
75	2
76	23
77	70
78	3
79	23

[1, 1, 2, 1, 1, 3, 3, 6, 1, 1, 4, 2, 5, 3, 9, 8, 4, 1, 3, 4, 36, 5, 2, 4, 10, 4, 18, 3, 21, 9, 6, 1, 6, 8, 12, 2, 51, 1, 2, 2, 21, 6, 6, 12, 1, 5, 5, 3, 10, 1, 11, 53, 9, 4, 3, 2, 1, 5, 12, 10, 9, 8, 5, 9, 7, 6, 62, 29, 16, 51, 12, 3, 30, 56, 2, 23, 70, 3, 23]

cp's OEIS Frontend

A152414 a(n) = least positive k such that k2^n(2^n-1) - 1 or k2^n(2^n-1) + 1 is prime.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	3
7	3
8	6
9	1
10	1
11	4
12	2
13	5
14	3
15	9
16	8
17	4
18	1
19	3
20	4
21	36
22	5
23	2
24	4
25	10
26	4
27	18
28	3
29	21
30	9
31	6
32	1
33	6
34	8
35	12
36	2
37	51
38	1
39	2
40	2
41	21
42	6
43	6
44	12
45	1
46	5
47	5
48	3
49	10
50	1
51	11
52	53
53	9
54	4
55	3
56	2
57	1
58	5
59	12
60	10
61	9
62	8
63	5
64	9
65	7
66	6
67	62
68	29
69	16
70	51
71	12
72	3
73	30
74	56
75	2
76	23
77	70
78	3
79	23

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	3
7	3
8	6
9	1
10	1
11	4
12	2
13	5
14	3
15	9
16	8
17	4
18	1
19	3
20	4
21	36
22	5
23	2
24	4
25	10
26	4
27	18
28	3
29	21
30	9
31	6
32	1
33	6
34	8
35	12
36	2
37	51
38	1
39	2
40	2
41	21
42	6
43	6
44	12
45	1
46	5
47	5
48	3
49	10
50	1
51	11
52	53
53	9
54	4
55	3
56	2
57	1
58	5
59	12
60	10
61	9
62	8
63	5
64	9
65	7
66	6
67	62
68	29
69	16
70	51
71	12
72	3
73	30
74	56
75	2
76	23
77	70
78	3
79	23

cp's OEIS Frontend

A152414 a(n) = least positive k such that k*2^n*(2^n-1) - 1 or k*2^n*(2^n-1) + 1 is prime.

Table of values

List of values

A152414 a(n) = least positive k such that k2^n(2^n-1) - 1 or k2^n(2^n-1) + 1 is prime.

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	3
7	3
8	6
9	1
10	1
11	4
12	2
13	5
14	3
15	9
16	8
17	4
18	1
19	3
20	4
21	36
22	5
23	2
24	4
25	10
26	4
27	18
28	3
29	21
30	9
31	6
32	1
33	6
34	8
35	12
36	2
37	51
38	1
39	2
40	2
41	21
42	6
43	6
44	12
45	1
46	5
47	5
48	3
49	10
50	1
51	11
52	53
53	9
54	4
55	3
56	2
57	1
58	5
59	12
60	10
61	9
62	8
63	5
64	9
65	7
66	6
67	62
68	29
69	16
70	51
71	12
72	3
73	30
74	56
75	2
76	23
77	70
78	3
79	23