A127958 - cp's OEIS frontend

A127958 Numbers x such that 1 + Sum_{k=1..n} 2^(2k-1) is not prime for n=1,2,...,x.

n	a(n)
1	4
2	7
3	10
4	12
5	13
6	14
7	16
8	17
9	18
10	19
11	20
12	22
13	23
14	24
15	25
16	26
17	27
18	28
19	29
20	31
21	32
22	33
23	34
24	35
25	36
26	37
27	38
28	40
29	41
30	42
31	43
32	44
33	45
34	46
35	47
36	48
37	49
38	51
39	52
40	53
41	54
42	55
43	56
44	57
45	58
46	59
47	60
48	61
49	62
50	64
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	75
62	76
63	77
64	78
65	79
66	80
67	81
68	82
69	84
70	85

[4, 7, 10, 12, 13, 14, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 84, 85]

cp's OEIS Frontend

A127958 Numbers x such that 1 + Sum_{k=1..n} 2^(2k-1) is not prime for n=1,2,...,x.

Table of values

List of values

n	a(n)
1	4
2	7
3	10
4	12
5	13
6	14
7	16
8	17
9	18
10	19
11	20
12	22
13	23
14	24
15	25
16	26
17	27
18	28
19	29
20	31
21	32
22	33
23	34
24	35
25	36
26	37
27	38
28	40
29	41
30	42
31	43
32	44
33	45
34	46
35	47
36	48
37	49
38	51
39	52
40	53
41	54
42	55
43	56
44	57
45	58
46	59
47	60
48	61
49	62
50	64
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	75
62	76
63	77
64	78
65	79
66	80
67	81
68	82
69	84
70	85

n	a(n)
1	4
2	7
3	10
4	12
5	13
6	14
7	16
8	17
9	18
10	19
11	20
12	22
13	23
14	24
15	25
16	26
17	27
18	28
19	29
20	31
21	32
22	33
23	34
24	35
25	36
26	37
27	38
28	40
29	41
30	42
31	43
32	44
33	45
34	46
35	47
36	48
37	49
38	51
39	52
40	53
41	54
42	55
43	56
44	57
45	58
46	59
47	60
48	61
49	62
50	64
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	75
62	76
63	77
64	78
65	79
66	80
67	81
68	82
69	84
70	85

n	a(n)
1	4
2	7
3	10
4	12
5	13
6	14
7	16
8	17
9	18
10	19
11	20
12	22
13	23
14	24
15	25
16	26
17	27
18	28
19	29
20	31
21	32
22	33
23	34
24	35
25	36
26	37
27	38
28	40
29	41
30	42
31	43
32	44
33	45
34	46
35	47
36	48
37	49
38	51
39	52
40	53
41	54
42	55
43	56
44	57
45	58
46	59
47	60
48	61
49	62
50	64
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	75
62	76
63	77
64	78
65	79
66	80
67	81
68	82
69	84
70	85