A051888 - cp's OEIS frontend

A051888 a(n) is the smallest prime p such that p*n! + 1 is prime.

n	a(n)
0	2
1	2
2	2
3	2
4	3
5	2
6	3
7	3
8	7
9	3
10	3
11	5
12	2
13	3
14	13
15	7
16	31
17	5
18	2
19	7
20	17
21	67
22	41
23	3
24	13
25	3
26	43
27	17
28	97
29	7
30	29
31	109
32	3
33	71
34	5
35	2
36	7
37	41
38	3
39	59
40	3
41	11
42	29
43	7
44	107
45	67
46	79
47	3
48	743
49	149
50	163
51	2
52	211
53	2
54	19
55	71
56	73
57	23
58	37
59	113
60	149
61	67
62	41
63	617
64	107
65	37
66	107
67	283
68	113
69	19
70	239
71	107
72	73
73	97
74	5

[2, 2, 2, 2, 3, 2, 3, 3, 7, 3, 3, 5, 2, 3, 13, 7, 31, 5, 2, 7, 17, 67, 41, 3, 13, 3, 43, 17, 97, 7, 29, 109, 3, 71, 5, 2, 7, 41, 3, 59, 3, 11, 29, 7, 107, 67, 79, 3, 743, 149, 163, 2, 211, 2, 19, 71, 73, 23, 37, 113, 149, 67, 41, 617, 107, 37, 107, 283, 113, 19, 239, 107, 73, 97, 5]

cp's OEIS Frontend

A051888 a(n) is the smallest prime p such that p*n! + 1 is prime.

Table of values

List of values

n	a(n)
0	2
1	2
2	2
3	2
4	3
5	2
6	3
7	3
8	7
9	3
10	3
11	5
12	2
13	3
14	13
15	7
16	31
17	5
18	2
19	7
20	17
21	67
22	41
23	3
24	13
25	3
26	43
27	17
28	97
29	7
30	29
31	109
32	3
33	71
34	5
35	2
36	7
37	41
38	3
39	59
40	3
41	11
42	29
43	7
44	107
45	67
46	79
47	3
48	743
49	149
50	163
51	2
52	211
53	2
54	19
55	71
56	73
57	23
58	37
59	113
60	149
61	67
62	41
63	617
64	107
65	37
66	107
67	283
68	113
69	19
70	239
71	107
72	73
73	97
74	5

n	a(n)
0	2
1	2
2	2
3	2
4	3
5	2
6	3
7	3
8	7
9	3
10	3
11	5
12	2
13	3
14	13
15	7
16	31
17	5
18	2
19	7
20	17
21	67
22	41
23	3
24	13
25	3
26	43
27	17
28	97
29	7
30	29
31	109
32	3
33	71
34	5
35	2
36	7
37	41
38	3
39	59
40	3
41	11
42	29
43	7
44	107
45	67
46	79
47	3
48	743
49	149
50	163
51	2
52	211
53	2
54	19
55	71
56	73
57	23
58	37
59	113
60	149
61	67
62	41
63	617
64	107
65	37
66	107
67	283
68	113
69	19
70	239
71	107
72	73
73	97
74	5

n	a(n)
0	2
1	2
2	2
3	2
4	3
5	2
6	3
7	3
8	7
9	3
10	3
11	5
12	2
13	3
14	13
15	7
16	31
17	5
18	2
19	7
20	17
21	67
22	41
23	3
24	13
25	3
26	43
27	17
28	97
29	7
30	29
31	109
32	3
33	71
34	5
35	2
36	7
37	41
38	3
39	59
40	3
41	11
42	29
43	7
44	107
45	67
46	79
47	3
48	743
49	149
50	163
51	2
52	211
53	2
54	19
55	71
56	73
57	23
58	37
59	113
60	149
61	67
62	41
63	617
64	107
65	37
66	107
67	283
68	113
69	19
70	239
71	107
72	73
73	97
74	5