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%I #6 Jul 19 2017 21:32:03
%S 3,5,7,11,13,15,19,21,23,29,31,33,35,37,39,43,47,53,55,57,59,61,65,67,
%T 69,71,77,79,83,87,91,93,95,101,103,105,107,109,111,115,127,129,131,
%U 133,139,141,143,145,149,151,155,157,159,161,163,165,167,173,177,179,181
%N Numbers n such that x^4 + y^4 != 0 (mod n) when both x, y (positive) are expressed mod n (i.e., 0 < x,y < n).
%C Example a(5)=13 since x^4 + y^4 = 13k (k being a natural number) has no integer solutions 0 < x,y < 13.
%K nonn
%O 1,1
%A _Carmine Suriano_, Sep 29 2009
%E Value 11 in the example corrected to 13 by _Carmine Suriano_, Oct 07 2009
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