A134855 - cp's OEIS frontend

A134855 Least odd prime p such that 1 + p*2^n is also prime.

n	a(n)
1	3
2	3
3	5
4	7
5	3
6	3
7	5
8	3
9	23
10	13
11	29
12	3
13	5
14	7
15	5
16	37
17	53
18	3
19	11
20	7
21	11
22	37
23	71
24	73
25	5
26	7
27	17
28	13
29	23
30	3
31	239
32	43
33	113
34	163
35	59
36	3
37	89
38	349
39	5
40	97
41	3
42	73
43	11
44	67
45	101
46	19
47	101
48	61
49	23
50	7
51	17
52	7
53	233
54	127
55	5
56	541
57	29
58	103
59	71
60	31
61	53
62	109
63	179
64	163
65	71
66	3
67	929
68	31
69	23
70	193
71	101
72	127

[3, 3, 5, 7, 3, 3, 5, 3, 23, 13, 29, 3, 5, 7, 5, 37, 53, 3, 11, 7, 11, 37, 71, 73, 5, 7, 17, 13, 23, 3, 239, 43, 113, 163, 59, 3, 89, 349, 5, 97, 3, 73, 11, 67, 101, 19, 101, 61, 23, 7, 17, 7, 233, 127, 5, 541, 29, 103, 71, 31, 53, 109, 179, 163, 71, 3, 929, 31, 23, 193, 101, 127]

cp's OEIS Frontend

A134855 Least odd prime p such that 1 + p*2^n is also prime.

Table of values

List of values

n	a(n)
1	3
2	3
3	5
4	7
5	3
6	3
7	5
8	3
9	23
10	13
11	29
12	3
13	5
14	7
15	5
16	37
17	53
18	3
19	11
20	7
21	11
22	37
23	71
24	73
25	5
26	7
27	17
28	13
29	23
30	3
31	239
32	43
33	113
34	163
35	59
36	3
37	89
38	349
39	5
40	97
41	3
42	73
43	11
44	67
45	101
46	19
47	101
48	61
49	23
50	7
51	17
52	7
53	233
54	127
55	5
56	541
57	29
58	103
59	71
60	31
61	53
62	109
63	179
64	163
65	71
66	3
67	929
68	31
69	23
70	193
71	101
72	127

n	a(n)
1	3
2	3
3	5
4	7
5	3
6	3
7	5
8	3
9	23
10	13
11	29
12	3
13	5
14	7
15	5
16	37
17	53
18	3
19	11
20	7
21	11
22	37
23	71
24	73
25	5
26	7
27	17
28	13
29	23
30	3
31	239
32	43
33	113
34	163
35	59
36	3
37	89
38	349
39	5
40	97
41	3
42	73
43	11
44	67
45	101
46	19
47	101
48	61
49	23
50	7
51	17
52	7
53	233
54	127
55	5
56	541
57	29
58	103
59	71
60	31
61	53
62	109
63	179
64	163
65	71
66	3
67	929
68	31
69	23
70	193
71	101
72	127

n	a(n)
1	3
2	3
3	5
4	7
5	3
6	3
7	5
8	3
9	23
10	13
11	29
12	3
13	5
14	7
15	5
16	37
17	53
18	3
19	11
20	7
21	11
22	37
23	71
24	73
25	5
26	7
27	17
28	13
29	23
30	3
31	239
32	43
33	113
34	163
35	59
36	3
37	89
38	349
39	5
40	97
41	3
42	73
43	11
44	67
45	101
46	19
47	101
48	61
49	23
50	7
51	17
52	7
53	233
54	127
55	5
56	541
57	29
58	103
59	71
60	31
61	53
62	109
63	179
64	163
65	71
66	3
67	929
68	31
69	23
70	193
71	101
72	127