A214501 - cp's OEIS frontend

A214501 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	2
3	1
4	1
5	2
6	1
7	1
8	6
9	1
10	2
11	1
12	6
13	8
14	8
15	41
16	11
17	5
18	8
19	11
20	24
21	35
22	15
23	22
24	5
25	11
26	19
27	15
28	16
29	60
30	10
31	21
32	35
33	82
34	13
35	8
36	4
37	1
38	44
39	4
40	33
41	12
42	29
43	59
44	45
45	17
46	60
47	4
48	1
49	119
50	38
51	6
52	35
53	1
54	29
55	48
56	100
57	72
58	31
59	128
60	27
61	33
62	29
63	41
64	14
65	21
66	40
67	19
68	52
69	36
70	79
71	54

[1, 2, 1, 1, 2, 1, 1, 6, 1, 2, 1, 6, 8, 8, 41, 11, 5, 8, 11, 24, 35, 15, 22, 5, 11, 19, 15, 16, 60, 10, 21, 35, 82, 13, 8, 4, 1, 44, 4, 33, 12, 29, 59, 45, 17, 60, 4, 1, 119, 38, 6, 35, 1, 29, 48, 100, 72, 31, 128, 27, 33, 29, 41, 14, 21, 40, 19, 52, 36, 79, 54]

cp's OEIS Frontend

A214501 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	2
3	1
4	1
5	2
6	1
7	1
8	6
9	1
10	2
11	1
12	6
13	8
14	8
15	41
16	11
17	5
18	8
19	11
20	24
21	35
22	15
23	22
24	5
25	11
26	19
27	15
28	16
29	60
30	10
31	21
32	35
33	82
34	13
35	8
36	4
37	1
38	44
39	4
40	33
41	12
42	29
43	59
44	45
45	17
46	60
47	4
48	1
49	119
50	38
51	6
52	35
53	1
54	29
55	48
56	100
57	72
58	31
59	128
60	27
61	33
62	29
63	41
64	14
65	21
66	40
67	19
68	52
69	36
70	79
71	54

n	a(n)
1	1
2	2
3	1
4	1
5	2
6	1
7	1
8	6
9	1
10	2
11	1
12	6
13	8
14	8
15	41
16	11
17	5
18	8
19	11
20	24
21	35
22	15
23	22
24	5
25	11
26	19
27	15
28	16
29	60
30	10
31	21
32	35
33	82
34	13
35	8
36	4
37	1
38	44
39	4
40	33
41	12
42	29
43	59
44	45
45	17
46	60
47	4
48	1
49	119
50	38
51	6
52	35
53	1
54	29
55	48
56	100
57	72
58	31
59	128
60	27
61	33
62	29
63	41
64	14
65	21
66	40
67	19
68	52
69	36
70	79
71	54

cp's OEIS Frontend

A214501 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

A214501 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	2
3	1
4	1
5	2
6	1
7	1
8	6
9	1
10	2
11	1
12	6
13	8
14	8
15	41
16	11
17	5
18	8
19	11
20	24
21	35
22	15
23	22
24	5
25	11
26	19
27	15
28	16
29	60
30	10
31	21
32	35
33	82
34	13
35	8
36	4
37	1
38	44
39	4
40	33
41	12
42	29
43	59
44	45
45	17
46	60
47	4
48	1
49	119
50	38
51	6
52	35
53	1
54	29
55	48
56	100
57	72
58	31
59	128
60	27
61	33
62	29
63	41
64	14
65	21
66	40
67	19
68	52
69	36
70	79
71	54