A210651 - cp's OEIS frontend

A210651 a(n)=least odd number k such that 3k2^n-1 is a prime number.

n	a(n)
1	1
2	1
3	1
4	1
5	5
6	1
7	1
8	9
9	15
10	5
11	1
12	29
13	3
14	5
15	3
16	15
17	5
18	1
19	17
20	19
21	3
22	11
23	23
24	13
25	19
26	19
27	7
28	9
29	15
30	71
31	5
32	19
33	49
34	1
35	11
36	15
37	7
38	1
39	21
40	39
41	5
42	11
43	1
44	19
45	55
46	11
47	71
48	39
49	23
50	29
51	7
52	61
53	49
54	15
55	1
56	11
57	17
58	37
59	15
60	31
61	23
62	19
63	3
64	1
65	33
66	21
67	37
68	21
69	17
70	9
71	41
72	43
73	5
74	7
75	25
76	1
77	19
78	37
79	23
80	5
81	27
82	5
83	37
84	31
85	15
86	85
87	67
88	43
89	79
90	77

[1, 1, 1, 1, 5, 1, 1, 9, 15, 5, 1, 29, 3, 5, 3, 15, 5, 1, 17, 19, 3, 11, 23, 13, 19, 19, 7, 9, 15, 71, 5, 19, 49, 1, 11, 15, 7, 1, 21, 39, 5, 11, 1, 19, 55, 11, 71, 39, 23, 29, 7, 61, 49, 15, 1, 11, 17, 37, 15, 31, 23, 19, 3, 1, 33, 21, 37, 21, 17, 9, 41, 43, 5, 7, 25, 1, 19, 37, 23, 5, 27, 5, 37, 31, 15, 85, 67, 43, 79, 77]

cp's OEIS Frontend

A210651 a(n)=least odd number k such that 3k2^n-1 is a prime number.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	5
6	1
7	1
8	9
9	15
10	5
11	1
12	29
13	3
14	5
15	3
16	15
17	5
18	1
19	17
20	19
21	3
22	11
23	23
24	13
25	19
26	19
27	7
28	9
29	15
30	71
31	5
32	19
33	49
34	1
35	11
36	15
37	7
38	1
39	21
40	39
41	5
42	11
43	1
44	19
45	55
46	11
47	71
48	39
49	23
50	29
51	7
52	61
53	49
54	15
55	1
56	11
57	17
58	37
59	15
60	31
61	23
62	19
63	3
64	1
65	33
66	21
67	37
68	21
69	17
70	9
71	41
72	43
73	5
74	7
75	25
76	1
77	19
78	37
79	23
80	5
81	27
82	5
83	37
84	31
85	15
86	85
87	67
88	43
89	79
90	77

n	a(n)
1	1
2	1
3	1
4	1
5	5
6	1
7	1
8	9
9	15
10	5
11	1
12	29
13	3
14	5
15	3
16	15
17	5
18	1
19	17
20	19
21	3
22	11
23	23
24	13
25	19
26	19
27	7
28	9
29	15
30	71
31	5
32	19
33	49
34	1
35	11
36	15
37	7
38	1
39	21
40	39
41	5
42	11
43	1
44	19
45	55
46	11
47	71
48	39
49	23
50	29
51	7
52	61
53	49
54	15
55	1
56	11
57	17
58	37
59	15
60	31
61	23
62	19
63	3
64	1
65	33
66	21
67	37
68	21
69	17
70	9
71	41
72	43
73	5
74	7
75	25
76	1
77	19
78	37
79	23
80	5
81	27
82	5
83	37
84	31
85	15
86	85
87	67
88	43
89	79
90	77

cp's OEIS Frontend

A210651 a(n)=least odd number k such that 3*k*2^n-1 is a prime number.

Table of values

List of values

A210651 a(n)=least odd number k such that 3k2^n-1 is a prime number.

n	a(n)
1	1
2	1
3	1
4	1
5	5
6	1
7	1
8	9
9	15
10	5
11	1
12	29
13	3
14	5
15	3
16	15
17	5
18	1
19	17
20	19
21	3
22	11
23	23
24	13
25	19
26	19
27	7
28	9
29	15
30	71
31	5
32	19
33	49
34	1
35	11
36	15
37	7
38	1
39	21
40	39
41	5
42	11
43	1
44	19
45	55
46	11
47	71
48	39
49	23
50	29
51	7
52	61
53	49
54	15
55	1
56	11
57	17
58	37
59	15
60	31
61	23
62	19
63	3
64	1
65	33
66	21
67	37
68	21
69	17
70	9
71	41
72	43
73	5
74	7
75	25
76	1
77	19
78	37
79	23
80	5
81	27
82	5
83	37
84	31
85	15
86	85
87	67
88	43
89	79
90	77