A094575 Numbers n with property that binomial (2n, n) / (n-1) is an integer.

2, 3, 5, 7, 16, 21, 25, 29, 41, 43, 46, 67, 73, 78, 89, 92, 105, 111, 127, 141, 154, 157, 171, 188, 191, 205, 210, 211, 221, 229, 232, 239, 241, 267, 277, 300, 305, 309, 313, 316, 323, 326, 331, 346, 369, 379, 415, 421, 430, 436, 441, 443, 451, 460, 461, 465

Offset

1,1

Links

Table of n, a(n) for n=1..56.

Mathematica

Select[ Range[468], Mod[Binomial[2#, # ], (# - 1)] == 0 &]

Crossrefs

Cf. A000108, A094453, A094576.

Contains A081767 as a subsequence.

Sequence in context: A025069 A319913 A073436 * A145968 A343537 A192579

Adjacent sequences: A094572 A094573 A094574 * A094576 A094577 A094578

Keyword

nonn

Author

Robert G. Wilson v, May 11 2004

Status

approved