A229927 - cp's OEIS frontend

A229927 Smallest k >= n such that (4^n-1)*2^k - 1 is prime.

n	a(n)
1	1
2	2
3	3
4	4
5	8
6	6
7	7
8	13
9	11
10	16
11	103
12	12
13	16
14	52
15	26
16	16
17	26
18	34
19	38
20	28
21	23
22	22
23	26
24	24
25	50
26	41
27	30
28	28
29	32
30	46
31	31
32	34
33	202
34	34
35	35
36	40
37	47
38	113
39	46
40	50
41	44
42	54
43	58
44	46
45	51
46	48
47	130
48	59
49	64
50	101
51	60
52	62
53	94
54	74
55	88
56	98
57	71
58	234
59	67
60	93
61	83
62	101
63	308
64	64
65	92

[1, 2, 3, 4, 8, 6, 7, 13, 11, 16, 103, 12, 16, 52, 26, 16, 26, 34, 38, 28, 23, 22, 26, 24, 50, 41, 30, 28, 32, 46, 31, 34, 202, 34, 35, 40, 47, 113, 46, 50, 44, 54, 58, 46, 51, 48, 130, 59, 64, 101, 60, 62, 94, 74, 88, 98, 71, 234, 67, 93, 83, 101, 308, 64, 92]

cp's OEIS Frontend

A229927 Smallest k >= n such that (4^n-1)*2^k - 1 is prime.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	8
6	6
7	7
8	13
9	11
10	16
11	103
12	12
13	16
14	52
15	26
16	16
17	26
18	34
19	38
20	28
21	23
22	22
23	26
24	24
25	50
26	41
27	30
28	28
29	32
30	46
31	31
32	34
33	202
34	34
35	35
36	40
37	47
38	113
39	46
40	50
41	44
42	54
43	58
44	46
45	51
46	48
47	130
48	59
49	64
50	101
51	60
52	62
53	94
54	74
55	88
56	98
57	71
58	234
59	67
60	93
61	83
62	101
63	308
64	64
65	92

n	a(n)
1	1
2	2
3	3
4	4
5	8
6	6
7	7
8	13
9	11
10	16
11	103
12	12
13	16
14	52
15	26
16	16
17	26
18	34
19	38
20	28
21	23
22	22
23	26
24	24
25	50
26	41
27	30
28	28
29	32
30	46
31	31
32	34
33	202
34	34
35	35
36	40
37	47
38	113
39	46
40	50
41	44
42	54
43	58
44	46
45	51
46	48
47	130
48	59
49	64
50	101
51	60
52	62
53	94
54	74
55	88
56	98
57	71
58	234
59	67
60	93
61	83
62	101
63	308
64	64
65	92

n	a(n)
1	1
2	2
3	3
4	4
5	8
6	6
7	7
8	13
9	11
10	16
11	103
12	12
13	16
14	52
15	26
16	16
17	26
18	34
19	38
20	28
21	23
22	22
23	26
24	24
25	50
26	41
27	30
28	28
29	32
30	46
31	31
32	34
33	202
34	34
35	35
36	40
37	47
38	113
39	46
40	50
41	44
42	54
43	58
44	46
45	51
46	48
47	130
48	59
49	64
50	101
51	60
52	62
53	94
54	74
55	88
56	98
57	71
58	234
59	67
60	93
61	83
62	101
63	308
64	64
65	92