A248849 - cp's OEIS frontend

A248849 Smallest k>0 such that 2^k*3^n-1 is a prime number.

n	a(n)
1	1
2	1
3	1
4	3
5	2
6	5
7	1
8	1
9	4
10	3
11	20
12	1
13	4
14	13
15	2
16	11
17	3
18	101
19	12
20	1
21	10
22	9
23	1
24	11
25	7
26	27
27	1
28	347
29	11
30	73
31	4
32	7
33	52
34	93
35	1
36	7
37	51
38	73
39	46
40	11
41	8
42	41
43	4
44	51
45	2
46	5
47	30
48	11
49	10
50	3
51	280
52	11
53	7
54	17
55	14
56	1
57	32
58	11
59	5
60	11
61	19
62	1
63	20
64	17
65	22
66	133
67	6
68	1

[1, 1, 1, 3, 2, 5, 1, 1, 4, 3, 20, 1, 4, 13, 2, 11, 3, 101, 12, 1, 10, 9, 1, 11, 7, 27, 1, 347, 11, 73, 4, 7, 52, 93, 1, 7, 51, 73, 46, 11, 8, 41, 4, 51, 2, 5, 30, 11, 10, 3, 280, 11, 7, 17, 14, 1, 32, 11, 5, 11, 19, 1, 20, 17, 22, 133, 6, 1]

cp's OEIS Frontend

A248849 Smallest k>0 such that 2^k*3^n-1 is a prime number.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	3
5	2
6	5
7	1
8	1
9	4
10	3
11	20
12	1
13	4
14	13
15	2
16	11
17	3
18	101
19	12
20	1
21	10
22	9
23	1
24	11
25	7
26	27
27	1
28	347
29	11
30	73
31	4
32	7
33	52
34	93
35	1
36	7
37	51
38	73
39	46
40	11
41	8
42	41
43	4
44	51
45	2
46	5
47	30
48	11
49	10
50	3
51	280
52	11
53	7
54	17
55	14
56	1
57	32
58	11
59	5
60	11
61	19
62	1
63	20
64	17
65	22
66	133
67	6
68	1

n	a(n)
1	1
2	1
3	1
4	3
5	2
6	5
7	1
8	1
9	4
10	3
11	20
12	1
13	4
14	13
15	2
16	11
17	3
18	101
19	12
20	1
21	10
22	9
23	1
24	11
25	7
26	27
27	1
28	347
29	11
30	73
31	4
32	7
33	52
34	93
35	1
36	7
37	51
38	73
39	46
40	11
41	8
42	41
43	4
44	51
45	2
46	5
47	30
48	11
49	10
50	3
51	280
52	11
53	7
54	17
55	14
56	1
57	32
58	11
59	5
60	11
61	19
62	1
63	20
64	17
65	22
66	133
67	6
68	1

n	a(n)
1	1
2	1
3	1
4	3
5	2
6	5
7	1
8	1
9	4
10	3
11	20
12	1
13	4
14	13
15	2
16	11
17	3
18	101
19	12
20	1
21	10
22	9
23	1
24	11
25	7
26	27
27	1
28	347
29	11
30	73
31	4
32	7
33	52
34	93
35	1
36	7
37	51
38	73
39	46
40	11
41	8
42	41
43	4
44	51
45	2
46	5
47	30
48	11
49	10
50	3
51	280
52	11
53	7
54	17
55	14
56	1
57	32
58	11
59	5
60	11
61	19
62	1
63	20
64	17
65	22
66	133
67	6
68	1