A035050 - cp's OEIS frontend

A035050 a(n) is the smallest k such that k*2^n + 1 is prime.

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	3
6	3
7	2
8	1
9	15
10	12
11	6
12	3
13	5
14	4
15	2
16	1
17	6
18	3
19	11
20	7
21	11
22	25
23	20
24	10
25	5
26	7
27	15
28	12
29	6
30	3
31	35
32	18
33	9
34	12
35	6
36	3
37	15
38	10
39	5
40	6
41	3
42	9
43	9
44	15
45	35
46	19
47	27
48	15
49	14
50	7
51	14
52	7
53	20
54	10
55	5
56	27
57	29
58	54
59	27
60	31
61	36
62	18
63	9
64	12
65	6
66	3
67	9
68	31
69	23
70	39
71	39
72	40
73	20
74	10
75	5
76	58
77	29
78	15
79	36
80	18
81	9
82	13

[1, 1, 1, 2, 1, 3, 3, 2, 1, 15, 12, 6, 3, 5, 4, 2, 1, 6, 3, 11, 7, 11, 25, 20, 10, 5, 7, 15, 12, 6, 3, 35, 18, 9, 12, 6, 3, 15, 10, 5, 6, 3, 9, 9, 15, 35, 19, 27, 15, 14, 7, 14, 7, 20, 10, 5, 27, 29, 54, 27, 31, 36, 18, 9, 12, 6, 3, 9, 31, 23, 39, 39, 40, 20, 10, 5, 58, 29, 15, 36, 18, 9, 13]

cp's OEIS Frontend

A035050 a(n) is the smallest k such that k*2^n + 1 is prime.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	3
6	3
7	2
8	1
9	15
10	12
11	6
12	3
13	5
14	4
15	2
16	1
17	6
18	3
19	11
20	7
21	11
22	25
23	20
24	10
25	5
26	7
27	15
28	12
29	6
30	3
31	35
32	18
33	9
34	12
35	6
36	3
37	15
38	10
39	5
40	6
41	3
42	9
43	9
44	15
45	35
46	19
47	27
48	15
49	14
50	7
51	14
52	7
53	20
54	10
55	5
56	27
57	29
58	54
59	27
60	31
61	36
62	18
63	9
64	12
65	6
66	3
67	9
68	31
69	23
70	39
71	39
72	40
73	20
74	10
75	5
76	58
77	29
78	15
79	36
80	18
81	9
82	13

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	3
6	3
7	2
8	1
9	15
10	12
11	6
12	3
13	5
14	4
15	2
16	1
17	6
18	3
19	11
20	7
21	11
22	25
23	20
24	10
25	5
26	7
27	15
28	12
29	6
30	3
31	35
32	18
33	9
34	12
35	6
36	3
37	15
38	10
39	5
40	6
41	3
42	9
43	9
44	15
45	35
46	19
47	27
48	15
49	14
50	7
51	14
52	7
53	20
54	10
55	5
56	27
57	29
58	54
59	27
60	31
61	36
62	18
63	9
64	12
65	6
66	3
67	9
68	31
69	23
70	39
71	39
72	40
73	20
74	10
75	5
76	58
77	29
78	15
79	36
80	18
81	9
82	13

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	3
6	3
7	2
8	1
9	15
10	12
11	6
12	3
13	5
14	4
15	2
16	1
17	6
18	3
19	11
20	7
21	11
22	25
23	20
24	10
25	5
26	7
27	15
28	12
29	6
30	3
31	35
32	18
33	9
34	12
35	6
36	3
37	15
38	10
39	5
40	6
41	3
42	9
43	9
44	15
45	35
46	19
47	27
48	15
49	14
50	7
51	14
52	7
53	20
54	10
55	5
56	27
57	29
58	54
59	27
60	31
61	36
62	18
63	9
64	12
65	6
66	3
67	9
68	31
69	23
70	39
71	39
72	40
73	20
74	10
75	5
76	58
77	29
78	15
79	36
80	18
81	9
82	13