A056175 - cp's OEIS frontend

A056175 Number of nonunitary prime divisors of the central binomial coefficient C(n, floor(n/2)) (A001405).

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	1
10	2
11	0
12	1
13	1
14	1
15	1
16	1
17	0
18	1
19	0
20	1
21	1
22	1
23	0
24	1
25	2
26	2
27	3
28	3
29	2
30	2
31	1
32	1
33	1
34	2
35	1
36	2
37	2
38	2
39	1
40	2
41	1
42	1
43	1
44	1
45	3
46	3
47	2
48	3
49	3
50	3
51	3
52	3
53	2
54	2
55	1
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	2
64	2
65	1
66	2
67	1
68	2
69	2
70	2
71	0
72	1
73	1
74	1
75	2
76	2
77	3
78	3
79	1
80	2
81	3
82	3
83	2
84	2
85	3
86	3
87	3
88	3
89	2
90	2
91	3
92	3
93	3
94	3
95	3
96	4
97	3
98	3
99	2
100	2
101	2
102	2
103	2
104	2
105	2

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

cp's OEIS Frontend

A056175 Number of nonunitary prime divisors of the central binomial coefficient C(n, floor(n/2)) (A001405).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	1
10	2
11	0
12	1
13	1
14	1
15	1
16	1
17	0
18	1
19	0
20	1
21	1
22	1
23	0
24	1
25	2
26	2
27	3
28	3
29	2
30	2
31	1
32	1
33	1
34	2
35	1
36	2
37	2
38	2
39	1
40	2
41	1
42	1
43	1
44	1
45	3
46	3
47	2
48	3
49	3
50	3
51	3
52	3
53	2
54	2
55	1
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	2
64	2
65	1
66	2
67	1
68	2
69	2
70	2
71	0
72	1
73	1
74	1
75	2
76	2
77	3
78	3
79	1
80	2
81	3
82	3
83	2
84	2
85	3
86	3
87	3
88	3
89	2
90	2
91	3
92	3
93	3
94	3
95	3
96	4
97	3
98	3
99	2
100	2
101	2
102	2
103	2
104	2
105	2

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	1
10	2
11	0
12	1
13	1
14	1
15	1
16	1
17	0
18	1
19	0
20	1
21	1
22	1
23	0
24	1
25	2
26	2
27	3
28	3
29	2
30	2
31	1
32	1
33	1
34	2
35	1
36	2
37	2
38	2
39	1
40	2
41	1
42	1
43	1
44	1
45	3
46	3
47	2
48	3
49	3
50	3
51	3
52	3
53	2
54	2
55	1
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	2
64	2
65	1
66	2
67	1
68	2
69	2
70	2
71	0
72	1
73	1
74	1
75	2
76	2
77	3
78	3
79	1
80	2
81	3
82	3
83	2
84	2
85	3
86	3
87	3
88	3
89	2
90	2
91	3
92	3
93	3
94	3
95	3
96	4
97	3
98	3
99	2
100	2
101	2
102	2
103	2
104	2
105	2

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	1
10	2
11	0
12	1
13	1
14	1
15	1
16	1
17	0
18	1
19	0
20	1
21	1
22	1
23	0
24	1
25	2
26	2
27	3
28	3
29	2
30	2
31	1
32	1
33	1
34	2
35	1
36	2
37	2
38	2
39	1
40	2
41	1
42	1
43	1
44	1
45	3
46	3
47	2
48	3
49	3
50	3
51	3
52	3
53	2
54	2
55	1
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	2
64	2
65	1
66	2
67	1
68	2
69	2
70	2
71	0
72	1
73	1
74	1
75	2
76	2
77	3
78	3
79	1
80	2
81	3
82	3
83	2
84	2
85	3
86	3
87	3
88	3
89	2
90	2
91	3
92	3
93	3
94	3
95	3
96	4
97	3
98	3
99	2
100	2
101	2
102	2
103	2
104	2
105	2