A231820 - cp's OEIS frontend

A231820 Least positive k such that n*k! - 1 is a prime, or 0 if no such k exists.

n	a(n)
1	3
2	2
3	1
4	1
5	3
6	1
7	2
8	1
9	2
10	2
11	4
12	1
13	4
14	1
15	2
16	2
17	3
18	1
19	2
20	1
21	2
22	2
23	3
24	1
25	3
26	5
27	2
28	3
29	3
30	1
31	2
32	1
33	3
34	2
35	4
36	2
37	2
38	1
39	3
40	2
41	4
42	1
43	3
44	1
45	2
46	4
47	3
48	1
49	2
50	6
51	2
52	2
53	3
54	1
55	2
56	5
57	2
58	3
59	3
60	1
61	10
62	1
63	4
64	2
65	3
66	2
67	3
68	1
69	2
70	2
71	7
72	1
73	8
74	1
75	2
76	2
77	3
78	3
79	2
80	1
81	5
82	2
83	8
84	1
85	3
86	4
87	2
88	4
89	15
90	1

[3, 2, 1, 1, 3, 1, 2, 1, 2, 2, 4, 1, 4, 1, 2, 2, 3, 1, 2, 1, 2, 2, 3, 1, 3, 5, 2, 3, 3, 1, 2, 1, 3, 2, 4, 2, 2, 1, 3, 2, 4, 1, 3, 1, 2, 4, 3, 1, 2, 6, 2, 2, 3, 1, 2, 5, 2, 3, 3, 1, 10, 1, 4, 2, 3, 2, 3, 1, 2, 2, 7, 1, 8, 1, 2, 2, 3, 3, 2, 1, 5, 2, 8, 1, 3, 4, 2, 4, 15, 1]

cp's OEIS Frontend

A231820 Least positive k such that n*k! - 1 is a prime, or 0 if no such k exists.

Table of values

List of values

n	a(n)
1	3
2	2
3	1
4	1
5	3
6	1
7	2
8	1
9	2
10	2
11	4
12	1
13	4
14	1
15	2
16	2
17	3
18	1
19	2
20	1
21	2
22	2
23	3
24	1
25	3
26	5
27	2
28	3
29	3
30	1
31	2
32	1
33	3
34	2
35	4
36	2
37	2
38	1
39	3
40	2
41	4
42	1
43	3
44	1
45	2
46	4
47	3
48	1
49	2
50	6
51	2
52	2
53	3
54	1
55	2
56	5
57	2
58	3
59	3
60	1
61	10
62	1
63	4
64	2
65	3
66	2
67	3
68	1
69	2
70	2
71	7
72	1
73	8
74	1
75	2
76	2
77	3
78	3
79	2
80	1
81	5
82	2
83	8
84	1
85	3
86	4
87	2
88	4
89	15
90	1

n	a(n)
1	3
2	2
3	1
4	1
5	3
6	1
7	2
8	1
9	2
10	2
11	4
12	1
13	4
14	1
15	2
16	2
17	3
18	1
19	2
20	1
21	2
22	2
23	3
24	1
25	3
26	5
27	2
28	3
29	3
30	1
31	2
32	1
33	3
34	2
35	4
36	2
37	2
38	1
39	3
40	2
41	4
42	1
43	3
44	1
45	2
46	4
47	3
48	1
49	2
50	6
51	2
52	2
53	3
54	1
55	2
56	5
57	2
58	3
59	3
60	1
61	10
62	1
63	4
64	2
65	3
66	2
67	3
68	1
69	2
70	2
71	7
72	1
73	8
74	1
75	2
76	2
77	3
78	3
79	2
80	1
81	5
82	2
83	8
84	1
85	3
86	4
87	2
88	4
89	15
90	1

n	a(n)
1	3
2	2
3	1
4	1
5	3
6	1
7	2
8	1
9	2
10	2
11	4
12	1
13	4
14	1
15	2
16	2
17	3
18	1
19	2
20	1
21	2
22	2
23	3
24	1
25	3
26	5
27	2
28	3
29	3
30	1
31	2
32	1
33	3
34	2
35	4
36	2
37	2
38	1
39	3
40	2
41	4
42	1
43	3
44	1
45	2
46	4
47	3
48	1
49	2
50	6
51	2
52	2
53	3
54	1
55	2
56	5
57	2
58	3
59	3
60	1
61	10
62	1
63	4
64	2
65	3
66	2
67	3
68	1
69	2
70	2
71	7
72	1
73	8
74	1
75	2
76	2
77	3
78	3
79	2
80	1
81	5
82	2
83	8
84	1
85	3
86	4
87	2
88	4
89	15
90	1