A131057 - cp's OEIS frontend

A131057 Least nonnegative k such that n!-k is semiprime.

n	a(n)
3	0
4	2
5	1
6	2
7	7
8	1
9	2
10	1
11	5
12	3
13	1
14	19
15	11
16	1
17	19
18	19
19	11
20	1
21	19
22	23
23	1
24	1
25	47
26	1
27	1
28	29
29	3
30	29
31	2
32	59
33	73
34	1
35	43
36	1
37	13
38	17
39	41
40	1
41	2
42	5
43	3
44	53
45	79
46	7
47	1
48	53
49	23
50	1
51	13
52	13
53	61
54	7
55	59
56	61
57	7
58	31
59	1
60	89
61	107
62	103
63	67
64	47
65	103
66	19
67	43
68	1
69	71
70	11
71	7
72	83
73	79
74	67
75	71

[0, 2, 1, 2, 7, 1, 2, 1, 5, 3, 1, 19, 11, 1, 19, 19, 11, 1, 19, 23, 1, 1, 47, 1, 1, 29, 3, 29, 2, 59, 73, 1, 43, 1, 13, 17, 41, 1, 2, 5, 3, 53, 79, 7, 1, 53, 23, 1, 13, 13, 61, 7, 59, 61, 7, 31, 1, 89, 107, 103, 67, 47, 103, 19, 43, 1, 71, 11, 7, 83, 79, 67, 71]

cp's OEIS Frontend

A131057 Least nonnegative k such that n!-k is semiprime.

Table of values

List of values

n	a(n)
3	0
4	2
5	1
6	2
7	7
8	1
9	2
10	1
11	5
12	3
13	1
14	19
15	11
16	1
17	19
18	19
19	11
20	1
21	19
22	23
23	1
24	1
25	47
26	1
27	1
28	29
29	3
30	29
31	2
32	59
33	73
34	1
35	43
36	1
37	13
38	17
39	41
40	1
41	2
42	5
43	3
44	53
45	79
46	7
47	1
48	53
49	23
50	1
51	13
52	13
53	61
54	7
55	59
56	61
57	7
58	31
59	1
60	89
61	107
62	103
63	67
64	47
65	103
66	19
67	43
68	1
69	71
70	11
71	7
72	83
73	79
74	67
75	71

n	a(n)
3	0
4	2
5	1
6	2
7	7
8	1
9	2
10	1
11	5
12	3
13	1
14	19
15	11
16	1
17	19
18	19
19	11
20	1
21	19
22	23
23	1
24	1
25	47
26	1
27	1
28	29
29	3
30	29
31	2
32	59
33	73
34	1
35	43
36	1
37	13
38	17
39	41
40	1
41	2
42	5
43	3
44	53
45	79
46	7
47	1
48	53
49	23
50	1
51	13
52	13
53	61
54	7
55	59
56	61
57	7
58	31
59	1
60	89
61	107
62	103
63	67
64	47
65	103
66	19
67	43
68	1
69	71
70	11
71	7
72	83
73	79
74	67
75	71

n	a(n)
3	0
4	2
5	1
6	2
7	7
8	1
9	2
10	1
11	5
12	3
13	1
14	19
15	11
16	1
17	19
18	19
19	11
20	1
21	19
22	23
23	1
24	1
25	47
26	1
27	1
28	29
29	3
30	29
31	2
32	59
33	73
34	1
35	43
36	1
37	13
38	17
39	41
40	1
41	2
42	5
43	3
44	53
45	79
46	7
47	1
48	53
49	23
50	1
51	13
52	13
53	61
54	7
55	59
56	61
57	7
58	31
59	1
60	89
61	107
62	103
63	67
64	47
65	103
66	19
67	43
68	1
69	71
70	11
71	7
72	83
73	79
74	67
75	71