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A004783 Numbers k such that 3!*(2k-4)!/(k!*(k-1)!) is an integer. 0

%I #15 Jan 27 2023 08:10:39

%S 2,3,4,7,13,16,19,21,29,43,46,67,78,85,89,92,100,105,111,121,127,141,

%T 154,157,171,188,191,199,205,210,211,217,221,229,232,239,241,267,274,

%U 277,300,309,313,316,323,326,331,343,346,369,379,415,421,430

%N Numbers k such that 3!*(2k-4)!/(k!*(k-1)!) is an integer.

%t Select[Range[500], IntegerQ[3! (2 # - 4)!/(#! (# - 1)!)] &] (* _Arkadiusz Wesolowski_, Sep 06 2011 *)

%K nonn

%O 1,1

%A _R. K. Guy_

%E Offset corrected and 2 initial terms added by _Arkadiusz Wesolowski_, Sep 06 2011

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Last modified April 16 05:35 EDT 2024. Contains 371697 sequences. (Running on oeis4.)