A126717 - cp's OEIS frontend

A126717 Least odd k such that k*2^n-1 is prime.

n	a(n)
0	3
1	3
2	1
3	1
4	3
5	1
6	3
7	1
8	5
9	7
10	5
11	3
12	5
13	1
14	5
15	9
16	17
17	1
18	3
19	1
20	17
21	7
22	33
23	13
24	39
25	57
26	11
27	21
28	27
29	7
30	213
31	1
32	5
33	31
34	3
35	25
36	17
37	21
38	3
39	25
40	107
41	15
42	33
43	3
44	35
45	7
46	23
47	31
48	5
49	19
50	11
51	21
52	65
53	147
54	5
55	3
56	33
57	51
58	77
59	45
60	17
61	1
62	53
63	9
64	3
65	67
66	63
67	43
68	63
69	51
70	27
71	73
72	5
73	15
74	21
75	25
76	3
77	55
78	47
79	69

[3, 3, 1, 1, 3, 1, 3, 1, 5, 7, 5, 3, 5, 1, 5, 9, 17, 1, 3, 1, 17, 7, 33, 13, 39, 57, 11, 21, 27, 7, 213, 1, 5, 31, 3, 25, 17, 21, 3, 25, 107, 15, 33, 3, 35, 7, 23, 31, 5, 19, 11, 21, 65, 147, 5, 3, 33, 51, 77, 45, 17, 1, 53, 9, 3, 67, 63, 43, 63, 51, 27, 73, 5, 15, 21, 25, 3, 55, 47, 69]

cp's OEIS Frontend

A126717 Least odd k such that k*2^n-1 is prime.

Table of values

List of values

n	a(n)
0	3
1	3
2	1
3	1
4	3
5	1
6	3
7	1
8	5
9	7
10	5
11	3
12	5
13	1
14	5
15	9
16	17
17	1
18	3
19	1
20	17
21	7
22	33
23	13
24	39
25	57
26	11
27	21
28	27
29	7
30	213
31	1
32	5
33	31
34	3
35	25
36	17
37	21
38	3
39	25
40	107
41	15
42	33
43	3
44	35
45	7
46	23
47	31
48	5
49	19
50	11
51	21
52	65
53	147
54	5
55	3
56	33
57	51
58	77
59	45
60	17
61	1
62	53
63	9
64	3
65	67
66	63
67	43
68	63
69	51
70	27
71	73
72	5
73	15
74	21
75	25
76	3
77	55
78	47
79	69

n	a(n)
0	3
1	3
2	1
3	1
4	3
5	1
6	3
7	1
8	5
9	7
10	5
11	3
12	5
13	1
14	5
15	9
16	17
17	1
18	3
19	1
20	17
21	7
22	33
23	13
24	39
25	57
26	11
27	21
28	27
29	7
30	213
31	1
32	5
33	31
34	3
35	25
36	17
37	21
38	3
39	25
40	107
41	15
42	33
43	3
44	35
45	7
46	23
47	31
48	5
49	19
50	11
51	21
52	65
53	147
54	5
55	3
56	33
57	51
58	77
59	45
60	17
61	1
62	53
63	9
64	3
65	67
66	63
67	43
68	63
69	51
70	27
71	73
72	5
73	15
74	21
75	25
76	3
77	55
78	47
79	69

n	a(n)
0	3
1	3
2	1
3	1
4	3
5	1
6	3
7	1
8	5
9	7
10	5
11	3
12	5
13	1
14	5
15	9
16	17
17	1
18	3
19	1
20	17
21	7
22	33
23	13
24	39
25	57
26	11
27	21
28	27
29	7
30	213
31	1
32	5
33	31
34	3
35	25
36	17
37	21
38	3
39	25
40	107
41	15
42	33
43	3
44	35
45	7
46	23
47	31
48	5
49	19
50	11
51	21
52	65
53	147
54	5
55	3
56	33
57	51
58	77
59	45
60	17
61	1
62	53
63	9
64	3
65	67
66	63
67	43
68	63
69	51
70	27
71	73
72	5
73	15
74	21
75	25
76	3
77	55
78	47
79	69