A212038 - cp's OEIS frontend

A212038 The size of the set of numbers k>=0 such that all (2^n-k)2^n-1 are prime but only (2^n-k)2^n+1 with the largest k is also the associated twin prime.

n	a(n)
4	1
5	7
6	5
7	2
8	4
9	11
10	6
11	1
12	3
13	2
14	31
15	2
16	11
17	11
18	11
19	6
20	30
21	16
22	2
23	36
24	90
25	56
26	11
27	52
28	13
29	36
30	10
31	62
32	20
33	31
34	23
35	28
36	30
37	14
38	47
39	22
40	10
41	5
42	104
43	39
44	11
45	14
46	64
47	184
48	209
49	176
50	193
51	162
52	25
53	38
54	23
55	5
56	27
57	157
58	5
59	17
60	32
61	90
62	1
63	199
64	96
65	83
66	29
67	82
68	12
69	220
70	19
71	40
72	37
73	13
74	16
75	120
76	11
77	130
78	12
79	77
80	202

[1, 7, 5, 2, 4, 11, 6, 1, 3, 2, 31, 2, 11, 11, 11, 6, 30, 16, 2, 36, 90, 56, 11, 52, 13, 36, 10, 62, 20, 31, 23, 28, 30, 14, 47, 22, 10, 5, 104, 39, 11, 14, 64, 184, 209, 176, 193, 162, 25, 38, 23, 5, 27, 157, 5, 17, 32, 90, 1, 199, 96, 83, 29, 82, 12, 220, 19, 40, 37, 13, 16, 120, 11, 130, 12, 77, 202]

cp's OEIS Frontend

A212038 The size of the set of numbers k>=0 such that all (2^n-k)2^n-1 are prime but only (2^n-k)2^n+1 with the largest k is also the associated twin prime.

Table of values

List of values

n	a(n)
4	1
5	7
6	5
7	2
8	4
9	11
10	6
11	1
12	3
13	2
14	31
15	2
16	11
17	11
18	11
19	6
20	30
21	16
22	2
23	36
24	90
25	56
26	11
27	52
28	13
29	36
30	10
31	62
32	20
33	31
34	23
35	28
36	30
37	14
38	47
39	22
40	10
41	5
42	104
43	39
44	11
45	14
46	64
47	184
48	209
49	176
50	193
51	162
52	25
53	38
54	23
55	5
56	27
57	157
58	5
59	17
60	32
61	90
62	1
63	199
64	96
65	83
66	29
67	82
68	12
69	220
70	19
71	40
72	37
73	13
74	16
75	120
76	11
77	130
78	12
79	77
80	202

n	a(n)
4	1
5	7
6	5
7	2
8	4
9	11
10	6
11	1
12	3
13	2
14	31
15	2
16	11
17	11
18	11
19	6
20	30
21	16
22	2
23	36
24	90
25	56
26	11
27	52
28	13
29	36
30	10
31	62
32	20
33	31
34	23
35	28
36	30
37	14
38	47
39	22
40	10
41	5
42	104
43	39
44	11
45	14
46	64
47	184
48	209
49	176
50	193
51	162
52	25
53	38
54	23
55	5
56	27
57	157
58	5
59	17
60	32
61	90
62	1
63	199
64	96
65	83
66	29
67	82
68	12
69	220
70	19
71	40
72	37
73	13
74	16
75	120
76	11
77	130
78	12
79	77
80	202

cp's OEIS Frontend

A212038 The size of the set of numbers k>=0 such that all (2^n-k)*2^n-1 are prime but only (2^n-k)*2^n+1 with the largest k is also the associated twin prime.

Table of values

List of values

A212038 The size of the set of numbers k>=0 such that all (2^n-k)2^n-1 are prime but only (2^n-k)2^n+1 with the largest k is also the associated twin prime.

n	a(n)
4	1
5	7
6	5
7	2
8	4
9	11
10	6
11	1
12	3
13	2
14	31
15	2
16	11
17	11
18	11
19	6
20	30
21	16
22	2
23	36
24	90
25	56
26	11
27	52
28	13
29	36
30	10
31	62
32	20
33	31
34	23
35	28
36	30
37	14
38	47
39	22
40	10
41	5
42	104
43	39
44	11
45	14
46	64
47	184
48	209
49	176
50	193
51	162
52	25
53	38
54	23
55	5
56	27
57	157
58	5
59	17
60	32
61	90
62	1
63	199
64	96
65	83
66	29
67	82
68	12
69	220
70	19
71	40
72	37
73	13
74	16
75	120
76	11
77	130
78	12
79	77
80	202