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%I #14 Jun 06 2016 00:08:23
%S 0,1,2,4,19,21
%N Numbers n such that n! is the sum of a square and a nonnegative cube.
%C Numbers n such that n! = x^2 + y^3 where x, y are integers and y >= 0, is soluble.
%C a(7) > 33. - _Giovanni Resta_, Jun 03 2016
%e 4 is a term because 4! = 4^2 + 2^3.
%e 19 is a term because 19! = 345427200^2 + 132480^3.
%e 21 is a term because 21! = 6389296200^2 + 2173500^3.
%Y Cf. A000142, A022549.
%K nonn,more
%O 1,3
%A _Altug Alkan_, May 25 2016