A056172 - cp's OEIS frontend

A056172 Number of non-unitary prime divisors of n!.

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	2
7	2
8	2
9	2
10	3
11	3
12	3
13	3
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	5
23	5
24	5
25	5
26	6
27	6
28	6
29	6
30	6
31	6
32	6
33	6
34	7
35	7
36	7
37	7
38	8
39	8
40	8
41	8
42	8
43	8
44	8
45	8
46	9
47	9
48	9
49	9
50	9
51	9
52	9
53	9
54	9
55	9
56	9
57	9
58	10
59	10
60	10
61	10
62	11
63	11
64	11
65	11
66	11
67	11
68	11
69	11
70	11
71	11
72	11
73	11
74	12
75	12
76	12
77	12
78	12
79	12
80	12
81	12
82	13
83	13
84	13
85	13
86	14
87	14
88	14

[0, 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14]

cp's OEIS Frontend

A056172 Number of non-unitary prime divisors of n!.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	2
7	2
8	2
9	2
10	3
11	3
12	3
13	3
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	5
23	5
24	5
25	5
26	6
27	6
28	6
29	6
30	6
31	6
32	6
33	6
34	7
35	7
36	7
37	7
38	8
39	8
40	8
41	8
42	8
43	8
44	8
45	8
46	9
47	9
48	9
49	9
50	9
51	9
52	9
53	9
54	9
55	9
56	9
57	9
58	10
59	10
60	10
61	10
62	11
63	11
64	11
65	11
66	11
67	11
68	11
69	11
70	11
71	11
72	11
73	11
74	12
75	12
76	12
77	12
78	12
79	12
80	12
81	12
82	13
83	13
84	13
85	13
86	14
87	14
88	14

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	2
7	2
8	2
9	2
10	3
11	3
12	3
13	3
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	5
23	5
24	5
25	5
26	6
27	6
28	6
29	6
30	6
31	6
32	6
33	6
34	7
35	7
36	7
37	7
38	8
39	8
40	8
41	8
42	8
43	8
44	8
45	8
46	9
47	9
48	9
49	9
50	9
51	9
52	9
53	9
54	9
55	9
56	9
57	9
58	10
59	10
60	10
61	10
62	11
63	11
64	11
65	11
66	11
67	11
68	11
69	11
70	11
71	11
72	11
73	11
74	12
75	12
76	12
77	12
78	12
79	12
80	12
81	12
82	13
83	13
84	13
85	13
86	14
87	14
88	14

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	2
7	2
8	2
9	2
10	3
11	3
12	3
13	3
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	5
23	5
24	5
25	5
26	6
27	6
28	6
29	6
30	6
31	6
32	6
33	6
34	7
35	7
36	7
37	7
38	8
39	8
40	8
41	8
42	8
43	8
44	8
45	8
46	9
47	9
48	9
49	9
50	9
51	9
52	9
53	9
54	9
55	9
56	9
57	9
58	10
59	10
60	10
61	10
62	11
63	11
64	11
65	11
66	11
67	11
68	11
69	11
70	11
71	11
72	11
73	11
74	12
75	12
76	12
77	12
78	12
79	12
80	12
81	12
82	13
83	13
84	13
85	13
86	14
87	14
88	14