A231549 - cp's OEIS frontend

A231549 Least k>0 such that k!*n!+1 is a prime, or 0 if no such k exists.

n	a(n)
1	1
2	1
3	1
4	4
5	2
6	8
7	3
8	3
9	3
10	4
11	1
12	2
13	3
14	5
15	8
16	4
17	10
18	2
19	11
20	9
21	5
22	5
23	7
24	3
25	14
26	18
27	1
28	40
29	24
30	5
31	5
32	18
33	8
34	20
35	2
36	49
37	1
38	3
39	5
40	28
41	1
42	17
43	38
44	27
45	11
46	16
47	10
48	3
49	24
50	270
51	2
52	45
53	2
54	15
55	175
56	64
57	17
58	6
59	4
60	3
61	8
62	18
63	13
64	17
65	65
66	32
67	12
68	7
69	72
70	13
71	21
72	33
73	1
74	24
75	36
76	76
77	1

[1, 1, 1, 4, 2, 8, 3, 3, 3, 4, 1, 2, 3, 5, 8, 4, 10, 2, 11, 9, 5, 5, 7, 3, 14, 18, 1, 40, 24, 5, 5, 18, 8, 20, 2, 49, 1, 3, 5, 28, 1, 17, 38, 27, 11, 16, 10, 3, 24, 270, 2, 45, 2, 15, 175, 64, 17, 6, 4, 3, 8, 18, 13, 17, 65, 32, 12, 7, 72, 13, 21, 33, 1, 24, 36, 76, 1]

cp's OEIS Frontend

A231549 Least k>0 such that k!*n!+1 is a prime, or 0 if no such k exists.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	4
5	2
6	8
7	3
8	3
9	3
10	4
11	1
12	2
13	3
14	5
15	8
16	4
17	10
18	2
19	11
20	9
21	5
22	5
23	7
24	3
25	14
26	18
27	1
28	40
29	24
30	5
31	5
32	18
33	8
34	20
35	2
36	49
37	1
38	3
39	5
40	28
41	1
42	17
43	38
44	27
45	11
46	16
47	10
48	3
49	24
50	270
51	2
52	45
53	2
54	15
55	175
56	64
57	17
58	6
59	4
60	3
61	8
62	18
63	13
64	17
65	65
66	32
67	12
68	7
69	72
70	13
71	21
72	33
73	1
74	24
75	36
76	76
77	1

n	a(n)
1	1
2	1
3	1
4	4
5	2
6	8
7	3
8	3
9	3
10	4
11	1
12	2
13	3
14	5
15	8
16	4
17	10
18	2
19	11
20	9
21	5
22	5
23	7
24	3
25	14
26	18
27	1
28	40
29	24
30	5
31	5
32	18
33	8
34	20
35	2
36	49
37	1
38	3
39	5
40	28
41	1
42	17
43	38
44	27
45	11
46	16
47	10
48	3
49	24
50	270
51	2
52	45
53	2
54	15
55	175
56	64
57	17
58	6
59	4
60	3
61	8
62	18
63	13
64	17
65	65
66	32
67	12
68	7
69	72
70	13
71	21
72	33
73	1
74	24
75	36
76	76
77	1

n	a(n)
1	1
2	1
3	1
4	4
5	2
6	8
7	3
8	3
9	3
10	4
11	1
12	2
13	3
14	5
15	8
16	4
17	10
18	2
19	11
20	9
21	5
22	5
23	7
24	3
25	14
26	18
27	1
28	40
29	24
30	5
31	5
32	18
33	8
34	20
35	2
36	49
37	1
38	3
39	5
40	28
41	1
42	17
43	38
44	27
45	11
46	16
47	10
48	3
49	24
50	270
51	2
52	45
53	2
54	15
55	175
56	64
57	17
58	6
59	4
60	3
61	8
62	18
63	13
64	17
65	65
66	32
67	12
68	7
69	72
70	13
71	21
72	33
73	1
74	24
75	36
76	76
77	1