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A056167 Numbers k such that k! is not divisible by the square of (f+1)!, where f = floor(k/2). 0

%I

%S 2,3,4,5,6,7,8,9,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,30,

%T 31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,

%U 56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79

%N Numbers k such that k! is not divisible by the square of (f+1)!, where f = floor(k/2).

%C Values of f are in A001057 or A004526.

%e 12 is here because 12!/(7!*7!) = 132/7 is not an integer. 10 is not here because 10!/(6!*6!) = 7 is an integer.

%Y Cf. A001057, A004526.

%K nonn

%O 1,1

%A _Labos Elemer_, Jul 27 2000

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Last modified August 17 19:38 EDT 2022. Contains 356189 sequences. (Running on oeis4.)