A075757 - cp's OEIS frontend

A075757 Smallest positive integer k such that n!+k!+1 is prime, or 0 if no such k exists.

n	a(n)
1	1
2	2
3	3
4	3
5	3
6	3
7	8
8	7
9	10
10	9
11	17
12	7
13	9
14	8
15	19
16	7
17	11
18	11
19	15
20	15
21	11
22	14
23	7
24	20
25	31
26	13
27	7
28	0
29	13
30	0
31	25
32	20
33	7
34	23
35	23
36	21
37	7
38	19
39	21
40	0
41	52
42	7
43	23
44	13
45	13
46	17
47	50
48	8
49	76
50	19
51	51
52	41
53	7
54	107
55	57
56	27
57	55
58	0
59	55
60	0
61	27
62	29
63	0
64	79
65	0
66	45
67	61
68	48
69	55
70	39
71	80
72	56
73	153
74	76
75	0
76	35
77	11

[1, 2, 3, 3, 3, 3, 8, 7, 10, 9, 17, 7, 9, 8, 19, 7, 11, 11, 15, 15, 11, 14, 7, 20, 31, 13, 7, 0, 13, 0, 25, 20, 7, 23, 23, 21, 7, 19, 21, 0, 52, 7, 23, 13, 13, 17, 50, 8, 76, 19, 51, 41, 7, 107, 57, 27, 55, 0, 55, 0, 27, 29, 0, 79, 0, 45, 61, 48, 55, 39, 80, 56, 153, 76, 0, 35, 11]

cp's OEIS Frontend

A075757 Smallest positive integer k such that n!+k!+1 is prime, or 0 if no such k exists.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	3
5	3
6	3
7	8
8	7
9	10
10	9
11	17
12	7
13	9
14	8
15	19
16	7
17	11
18	11
19	15
20	15
21	11
22	14
23	7
24	20
25	31
26	13
27	7
28	0
29	13
30	0
31	25
32	20
33	7
34	23
35	23
36	21
37	7
38	19
39	21
40	0
41	52
42	7
43	23
44	13
45	13
46	17
47	50
48	8
49	76
50	19
51	51
52	41
53	7
54	107
55	57
56	27
57	55
58	0
59	55
60	0
61	27
62	29
63	0
64	79
65	0
66	45
67	61
68	48
69	55
70	39
71	80
72	56
73	153
74	76
75	0
76	35
77	11

n	a(n)
1	1
2	2
3	3
4	3
5	3
6	3
7	8
8	7
9	10
10	9
11	17
12	7
13	9
14	8
15	19
16	7
17	11
18	11
19	15
20	15
21	11
22	14
23	7
24	20
25	31
26	13
27	7
28	0
29	13
30	0
31	25
32	20
33	7
34	23
35	23
36	21
37	7
38	19
39	21
40	0
41	52
42	7
43	23
44	13
45	13
46	17
47	50
48	8
49	76
50	19
51	51
52	41
53	7
54	107
55	57
56	27
57	55
58	0
59	55
60	0
61	27
62	29
63	0
64	79
65	0
66	45
67	61
68	48
69	55
70	39
71	80
72	56
73	153
74	76
75	0
76	35
77	11

n	a(n)
1	1
2	2
3	3
4	3
5	3
6	3
7	8
8	7
9	10
10	9
11	17
12	7
13	9
14	8
15	19
16	7
17	11
18	11
19	15
20	15
21	11
22	14
23	7
24	20
25	31
26	13
27	7
28	0
29	13
30	0
31	25
32	20
33	7
34	23
35	23
36	21
37	7
38	19
39	21
40	0
41	52
42	7
43	23
44	13
45	13
46	17
47	50
48	8
49	76
50	19
51	51
52	41
53	7
54	107
55	57
56	27
57	55
58	0
59	55
60	0
61	27
62	29
63	0
64	79
65	0
66	45
67	61
68	48
69	55
70	39
71	80
72	56
73	153
74	76
75	0
76	35
77	11