A182910 - cp's OEIS frontend

A182910 Number of unitary prime divisors of the swinging factorial (A056040) n$ = n! / floor(n/2)!^2.

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

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

cp's OEIS Frontend

A182910 Number of unitary prime divisors of the swinging factorial (A056040) n$ = n! / floor(n/2)!^2.

Table of values

List of values

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

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

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