A214502 - cp's OEIS frontend

A214502 The size of the set of numbers k>=0 such that all (3^n+k)2^n-1 are prime but only the last (largest) (3^n+k)2^n+1 is also an associated twin prime.

n	a(n)
1	1
2	3
3	2
4	5
5	16
6	2
7	2
8	18
9	2
10	8
11	8
12	10
13	14
14	9
15	5
16	43
17	15
18	1
19	56
20	13
21	5
22	151
23	7
24	20
25	107
26	3
27	30
28	8
29	16
30	31
31	8
32	21
33	3
34	103
35	57
36	38
37	28
38	37
39	99
40	5
41	15
42	50
43	87
44	31
45	67
46	107
47	1
48	113
49	69
50	12
51	41
52	19
53	23
54	43
55	150
56	100
57	49
58	76
59	3
60	159
61	48
62	86
63	49
64	81
65	62
66	48
67	118
68	66

[1, 3, 2, 5, 16, 2, 2, 18, 2, 8, 8, 10, 14, 9, 5, 43, 15, 1, 56, 13, 5, 151, 7, 20, 107, 3, 30, 8, 16, 31, 8, 21, 3, 103, 57, 38, 28, 37, 99, 5, 15, 50, 87, 31, 67, 107, 1, 113, 69, 12, 41, 19, 23, 43, 150, 100, 49, 76, 3, 159, 48, 86, 49, 81, 62, 48, 118, 66]

cp's OEIS Frontend

A214502 The size of the set of numbers k>=0 such that all (3^n+k)2^n-1 are prime but only the last (largest) (3^n+k)2^n+1 is also an associated twin prime.

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	5
5	16
6	2
7	2
8	18
9	2
10	8
11	8
12	10
13	14
14	9
15	5
16	43
17	15
18	1
19	56
20	13
21	5
22	151
23	7
24	20
25	107
26	3
27	30
28	8
29	16
30	31
31	8
32	21
33	3
34	103
35	57
36	38
37	28
38	37
39	99
40	5
41	15
42	50
43	87
44	31
45	67
46	107
47	1
48	113
49	69
50	12
51	41
52	19
53	23
54	43
55	150
56	100
57	49
58	76
59	3
60	159
61	48
62	86
63	49
64	81
65	62
66	48
67	118
68	66

n	a(n)
1	1
2	3
3	2
4	5
5	16
6	2
7	2
8	18
9	2
10	8
11	8
12	10
13	14
14	9
15	5
16	43
17	15
18	1
19	56
20	13
21	5
22	151
23	7
24	20
25	107
26	3
27	30
28	8
29	16
30	31
31	8
32	21
33	3
34	103
35	57
36	38
37	28
38	37
39	99
40	5
41	15
42	50
43	87
44	31
45	67
46	107
47	1
48	113
49	69
50	12
51	41
52	19
53	23
54	43
55	150
56	100
57	49
58	76
59	3
60	159
61	48
62	86
63	49
64	81
65	62
66	48
67	118
68	66

cp's OEIS Frontend

A214502 The size of the set of numbers k>=0 such that all (3^n+k)*2^n-1 are prime but only the last (largest) (3^n+k)*2^n+1 is also an associated twin prime.

Table of values

List of values

A214502 The size of the set of numbers k>=0 such that all (3^n+k)2^n-1 are prime but only the last (largest) (3^n+k)2^n+1 is also an associated twin prime.

n	a(n)
1	1
2	3
3	2
4	5
5	16
6	2
7	2
8	18
9	2
10	8
11	8
12	10
13	14
14	9
15	5
16	43
17	15
18	1
19	56
20	13
21	5
22	151
23	7
24	20
25	107
26	3
27	30
28	8
29	16
30	31
31	8
32	21
33	3
34	103
35	57
36	38
37	28
38	37
39	99
40	5
41	15
42	50
43	87
44	31
45	67
46	107
47	1
48	113
49	69
50	12
51	41
52	19
53	23
54	43
55	150
56	100
57	49
58	76
59	3
60	159
61	48
62	86
63	49
64	81
65	62
66	48
67	118
68	66