A054991 - cp's OEIS frontend

A054991 Number of prime divisors of n! - 1 (counted with multiplicity).

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	1
7	1
8	2
9	3
10	2
11	4
12	1
13	2
14	1
15	5
16	2
17	3
18	3
19	3
20	2
21	4
22	3
23	2
24	2
25	3
26	2
27	2
28	4
29	5
30	1
31	3
32	1
33	1
34	2
35	3
36	2
37	5
38	1
39	4
40	2
41	4
42	4
43	7
44	4
45	5
46	5
47	2
48	4
49	3
50	2
51	5
52	5
53	4
54	6
55	6
56	5
57	6
58	5
59	2
60	3
61	4
62	4
63	5
64	4
65	6
66	4
67	7
68	2
69	6
70	5
71	5
72	3
73	4
74	5
75	7
76	3
77	5
78	4
79	2
80	4
81	4
82	4
83	4
84	6
85	2
86	3
87	4

[0, 0, 1, 1, 2, 1, 1, 2, 3, 2, 4, 1, 2, 1, 5, 2, 3, 3, 3, 2, 4, 3, 2, 2, 3, 2, 2, 4, 5, 1, 3, 1, 1, 2, 3, 2, 5, 1, 4, 2, 4, 4, 7, 4, 5, 5, 2, 4, 3, 2, 5, 5, 4, 6, 6, 5, 6, 5, 2, 3, 4, 4, 5, 4, 6, 4, 7, 2, 6, 5, 5, 3, 4, 5, 7, 3, 5, 4, 2, 4, 4, 4, 4, 6, 2, 3, 4]

cp's OEIS Frontend

A054991 Number of prime divisors of n! - 1 (counted with multiplicity).

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	1
7	1
8	2
9	3
10	2
11	4
12	1
13	2
14	1
15	5
16	2
17	3
18	3
19	3
20	2
21	4
22	3
23	2
24	2
25	3
26	2
27	2
28	4
29	5
30	1
31	3
32	1
33	1
34	2
35	3
36	2
37	5
38	1
39	4
40	2
41	4
42	4
43	7
44	4
45	5
46	5
47	2
48	4
49	3
50	2
51	5
52	5
53	4
54	6
55	6
56	5
57	6
58	5
59	2
60	3
61	4
62	4
63	5
64	4
65	6
66	4
67	7
68	2
69	6
70	5
71	5
72	3
73	4
74	5
75	7
76	3
77	5
78	4
79	2
80	4
81	4
82	4
83	4
84	6
85	2
86	3
87	4

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	1
7	1
8	2
9	3
10	2
11	4
12	1
13	2
14	1
15	5
16	2
17	3
18	3
19	3
20	2
21	4
22	3
23	2
24	2
25	3
26	2
27	2
28	4
29	5
30	1
31	3
32	1
33	1
34	2
35	3
36	2
37	5
38	1
39	4
40	2
41	4
42	4
43	7
44	4
45	5
46	5
47	2
48	4
49	3
50	2
51	5
52	5
53	4
54	6
55	6
56	5
57	6
58	5
59	2
60	3
61	4
62	4
63	5
64	4
65	6
66	4
67	7
68	2
69	6
70	5
71	5
72	3
73	4
74	5
75	7
76	3
77	5
78	4
79	2
80	4
81	4
82	4
83	4
84	6
85	2
86	3
87	4

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	1
7	1
8	2
9	3
10	2
11	4
12	1
13	2
14	1
15	5
16	2
17	3
18	3
19	3
20	2
21	4
22	3
23	2
24	2
25	3
26	2
27	2
28	4
29	5
30	1
31	3
32	1
33	1
34	2
35	3
36	2
37	5
38	1
39	4
40	2
41	4
42	4
43	7
44	4
45	5
46	5
47	2
48	4
49	3
50	2
51	5
52	5
53	4
54	6
55	6
56	5
57	6
58	5
59	2
60	3
61	4
62	4
63	5
64	4
65	6
66	4
67	7
68	2
69	6
70	5
71	5
72	3
73	4
74	5
75	7
76	3
77	5
78	4
79	2
80	4
81	4
82	4
83	4
84	6
85	2
86	3
87	4