A118562 - cp's OEIS frontend

A118562 Least number k such that binomial(2k,k) is divisible by all squares to n squared but not (n+1) squared, or 0 if impossible.

n	a(n)
1	1
2	3
3	5
4	15
5	0
6	23
7	89
8	95
9	0
10	123
11	0
12	215
13	0
14	0
15	1117
16	943
17	0
18	2003
19	0
20	0
21	0
22	3455
23	0
24	1439
25	0
26	7846
27	0
28	7916
29	0
30	14735
31	13103
32	0
33	0
34	0
35	0
36	23711
37	0
38	0
39	0
40	24049
41	0
42	44857
43	0
44	0
45	0
46	44711
47	0
48	47594
49	0
50	0
51	0
52	77021
53	0
54	0
55	0
56	0
57	0
58	195765
59	0
60	381398
61	0
62	0
63	374435
64	0
65	0

[1, 3, 5, 15, 0, 23, 89, 95, 0, 123, 0, 215, 0, 0, 1117, 943, 0, 2003, 0, 0, 0, 3455, 0, 1439, 0, 7846, 0, 7916, 0, 14735, 13103, 0, 0, 0, 0, 23711, 0, 0, 0, 24049, 0, 44857, 0, 0, 0, 44711, 0, 47594, 0, 0, 0, 77021, 0, 0, 0, 0, 0, 195765, 0, 381398, 0, 0, 374435, 0, 0]

cp's OEIS Frontend

A118562 Least number k such that binomial(2k,k) is divisible by all squares to n squared but not (n+1) squared, or 0 if impossible.

Table of values

List of values