A178071 - cp's OEIS frontend

A178071 Numbers k such that exactly one d, 2 <= d <= k/2, exists which divides binomial(k-d-1, d-1) and is not coprime to k.

n	a(n)
1	14
2	16
3	18
4	22
5	27
6	28
7	39
8	55
9	65
10	77
11	85
12	221
13	437
14	1517
15	2021
16	4757
17	6557
18	9797
19	11021
20	12317
21	16637
22	27221
23	38021
24	50621
25	53357
26	77837
27	95477
28	99221
29	123197
30	145157
31	159197
32	194477
33	210677
34	216221
35	239117
36	250997
37	378221
38	416021
39	455621
40	549077
41	576077

[14, 16, 18, 22, 27, 28, 39, 55, 65, 77, 85, 221, 437, 1517, 2021, 4757, 6557, 9797, 11021, 12317, 16637, 27221, 38021, 50621, 53357, 77837, 95477, 99221, 123197, 145157, 159197, 194477, 210677, 216221, 239117, 250997, 378221, 416021, 455621, 549077, 576077]

cp's OEIS Frontend

A178071 Numbers k such that exactly one d, 2 <= d <= k/2, exists which divides binomial(k-d-1, d-1) and is not coprime to k.

Table of values

List of values