A111869 - cp's OEIS frontend

A111869 Least number k such that C(2k,k) is divisible by n^2.

n	a(n)
1	1
2	3
3	5
4	15
5	13
6	5
7	25
8	63
9	41
10	13
11	61
12	15
13	85
14	25
15	14
16	255
17	145
18	41
19	181
20	23
21	25
22	61
23	265
24	95
25	313
26	85
27	365
28	27
29	421
30	14
31	481
32	1023
33	61
34	145
35	39
36	53
37	685
38	181
39	86
40	63
41	841
42	25
43	925
44	61
45	44
46	265
47	1105
48	383
49	1201
50	313
51	145
52	85
53	1405
54	365
55	63
56	95
57	181
58	421
59	1741
60	23
61	1861

[1, 3, 5, 15, 13, 5, 25, 63, 41, 13, 61, 15, 85, 25, 14, 255, 145, 41, 181, 23, 25, 61, 265, 95, 313, 85, 365, 27, 421, 14, 481, 1023, 61, 145, 39, 53, 685, 181, 86, 63, 841, 25, 925, 61, 44, 265, 1105, 383, 1201, 313, 145, 85, 1405, 365, 63, 95, 181, 421, 1741, 23, 1861]

cp's OEIS Frontend

A111869 Least number k such that C(2k,k) is divisible by n^2.

Table of values

List of values