A240606 - cp's OEIS frontend

A240606 Let the prime factorization of (2n)! be 2^e_13^e_25^e_3...; then a(n) = maximal k such that e_1, ..., e_k are all even.

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

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

cp's OEIS Frontend

A240606 Let the prime factorization of (2n)! be 2^e_13^e_25^e_3...; then a(n) = maximal k such that e_1, ..., e_k are all even.

Table of values

List of values

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

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

cp's OEIS Frontend

A240606 Let the prime factorization of (2*n)! be 2^e_1*3^e_2*5^e_3*...; then a(n) = maximal k such that e_1, ..., e_k are all even.

Table of values

List of values

A240606 Let the prime factorization of (2n)! be 2^e_13^e_25^e_3...; then a(n) = maximal k such that e_1, ..., e_k are all even.

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