A006254 - cp's OEIS frontend

A006254 Numbers k such that 2k-1 is prime.

n	a(n)
1	2
2	3
3	4
4	6
5	7
6	9
7	10
8	12
9	15
10	16
11	19
12	21
13	22
14	24
15	27
16	30
17	31
18	34
19	36
20	37
21	40
22	42
23	45
24	49
25	51
26	52
27	54
28	55
29	57
30	64
31	66
32	69
33	70
34	75
35	76
36	79
37	82
38	84
39	87
40	90
41	91
42	96
43	97
44	99
45	100
46	106
47	112
48	114
49	115
50	117
51	120
52	121
53	126
54	129
55	132
56	135
57	136
58	139
59	141
60	142
61	147
62	154
63	156
64	157

[2, 3, 4, 6, 7, 9, 10, 12, 15, 16, 19, 21, 22, 24, 27, 30, 31, 34, 36, 37, 40, 42, 45, 49, 51, 52, 54, 55, 57, 64, 66, 69, 70, 75, 76, 79, 82, 84, 87, 90, 91, 96, 97, 99, 100, 106, 112, 114, 115, 117, 120, 121, 126, 129, 132, 135, 136, 139, 141, 142, 147, 154, 156, 157]

cp's OEIS Frontend

A006254 Numbers k such that 2k-1 is prime.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	6
5	7
6	9
7	10
8	12
9	15
10	16
11	19
12	21
13	22
14	24
15	27
16	30
17	31
18	34
19	36
20	37
21	40
22	42
23	45
24	49
25	51
26	52
27	54
28	55
29	57
30	64
31	66
32	69
33	70
34	75
35	76
36	79
37	82
38	84
39	87
40	90
41	91
42	96
43	97
44	99
45	100
46	106
47	112
48	114
49	115
50	117
51	120
52	121
53	126
54	129
55	132
56	135
57	136
58	139
59	141
60	142
61	147
62	154
63	156
64	157

n	a(n)
1	2
2	3
3	4
4	6
5	7
6	9
7	10
8	12
9	15
10	16
11	19
12	21
13	22
14	24
15	27
16	30
17	31
18	34
19	36
20	37
21	40
22	42
23	45
24	49
25	51
26	52
27	54
28	55
29	57
30	64
31	66
32	69
33	70
34	75
35	76
36	79
37	82
38	84
39	87
40	90
41	91
42	96
43	97
44	99
45	100
46	106
47	112
48	114
49	115
50	117
51	120
52	121
53	126
54	129
55	132
56	135
57	136
58	139
59	141
60	142
61	147
62	154
63	156
64	157

n	a(n)
1	2
2	3
3	4
4	6
5	7
6	9
7	10
8	12
9	15
10	16
11	19
12	21
13	22
14	24
15	27
16	30
17	31
18	34
19	36
20	37
21	40
22	42
23	45
24	49
25	51
26	52
27	54
28	55
29	57
30	64
31	66
32	69
33	70
34	75
35	76
36	79
37	82
38	84
39	87
40	90
41	91
42	96
43	97
44	99
45	100
46	106
47	112
48	114
49	115
50	117
51	120
52	121
53	126
54	129
55	132
56	135
57	136
58	139
59	141
60	142
61	147
62	154
63	156
64	157