A094576 Numbers k with property that binomial(2k, k) / (k-2) is an integer.

3, 4, 5, 6, 8, 14, 17, 20, 22, 26, 30, 42, 44, 47, 68, 74, 79, 86, 90, 93, 101, 106, 112, 122, 128, 142, 155, 158, 172, 189, 192, 200, 206, 211, 212, 218, 222, 230, 233, 240, 242, 268, 275, 278, 301, 306, 310, 314, 317, 324, 327, 332, 338, 344, 347, 370, 380, 416

Offset: 1

Author

Robert G. Wilson v, May 11 2004

Keywords

• nonn

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000108, A094453, A094575.

Programs

Mathematica

Select[ Range[421], Mod[Binomial[2#, # ], (# - 2)] == 0 &]