A061412 - cp's OEIS frontend

A061412 Numbers k such that m*2^k + 1 is prime for exactly one coefficient m in the range 0 <= m <= k.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	18
7	21
8	23
9	24
10	26
11	30
12	32
13	34
14	35
15	56
16	57
17	58
18	59
19	69
20	70
21	71
22	87
23	95
24	96
25	97
26	106
27	107
28	108
29	109
30	112
31	116
32	120
33	121
34	131
35	137
36	139
37	140
38	142
39	150
40	151
41	156
42	159
43	161
44	163
45	171
46	172
47	176
48	177
49	178
50	181
51	191
52	192
53	194
54	195
55	196
56	197
57	212
58	219
59	220

[1, 2, 3, 4, 5, 18, 21, 23, 24, 26, 30, 32, 34, 35, 56, 57, 58, 59, 69, 70, 71, 87, 95, 96, 97, 106, 107, 108, 109, 112, 116, 120, 121, 131, 137, 139, 140, 142, 150, 151, 156, 159, 161, 163, 171, 172, 176, 177, 178, 181, 191, 192, 194, 195, 196, 197, 212, 219, 220]

cp's OEIS Frontend

A061412 Numbers k such that m*2^k + 1 is prime for exactly one coefficient m in the range 0 <= m <= k.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	18
7	21
8	23
9	24
10	26
11	30
12	32
13	34
14	35
15	56
16	57
17	58
18	59
19	69
20	70
21	71
22	87
23	95
24	96
25	97
26	106
27	107
28	108
29	109
30	112
31	116
32	120
33	121
34	131
35	137
36	139
37	140
38	142
39	150
40	151
41	156
42	159
43	161
44	163
45	171
46	172
47	176
48	177
49	178
50	181
51	191
52	192
53	194
54	195
55	196
56	197
57	212
58	219
59	220

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	18
7	21
8	23
9	24
10	26
11	30
12	32
13	34
14	35
15	56
16	57
17	58
18	59
19	69
20	70
21	71
22	87
23	95
24	96
25	97
26	106
27	107
28	108
29	109
30	112
31	116
32	120
33	121
34	131
35	137
36	139
37	140
38	142
39	150
40	151
41	156
42	159
43	161
44	163
45	171
46	172
47	176
48	177
49	178
50	181
51	191
52	192
53	194
54	195
55	196
56	197
57	212
58	219
59	220

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	18
7	21
8	23
9	24
10	26
11	30
12	32
13	34
14	35
15	56
16	57
17	58
18	59
19	69
20	70
21	71
22	87
23	95
24	96
25	97
26	106
27	107
28	108
29	109
30	112
31	116
32	120
33	121
34	131
35	137
36	139
37	140
38	142
39	150
40	151
41	156
42	159
43	161
44	163
45	171
46	172
47	176
48	177
49	178
50	181
51	191
52	192
53	194
54	195
55	196
56	197
57	212
58	219
59	220