A106790 - cp's OEIS frontend

A106790 Smallest k>0 such that binomial(n,k) + 1 is prime.

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

[1, 1, 3, 1, 2, 1, 7, 2, 2, 1, 4, 1, 2, 5, 15, 1, 2, 1, 4, 2, 2, 1, 23, 2, 6, 4, 4, 1, 7, 1, 31, 10, 6, 10, 4, 1, 18, 15, 9, 1, 2, 1, 17, 2, 2, 1, 23, 2, 4, 20, 6, 1, 6, 8, 10, 6, 2, 1, 59, 1, 2, 25, 63, 2, 2, 1, 67, 8, 2, 1]

cp's OEIS Frontend

A106790 Smallest k>0 such that binomial(n,k) + 1 is prime.

Table of values

List of values

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

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

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