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Numbers n with property that binomial (2n, n) / (n-1) is an integer.
3

%I #4 Nov 23 2015 23:07:50

%S 2,3,5,7,16,21,25,29,41,43,46,67,73,78,89,92,105,111,127,141,154,157,

%T 171,188,191,205,210,211,221,229,232,239,241,267,277,300,305,309,313,

%U 316,323,326,331,346,369,379,415,421,430,436,441,443,451,460,461,465

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

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

%Y Cf. A000108, A094453, A094576.

%Y Contains A081767 as a subsequence.

%K nonn

%O 1,1

%A _Robert G. Wilson v_, May 11 2004