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%I #9 Mar 14 2015 11:40:50
%S 3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,19,20,21,22,23,24,25,26,27,28,
%T 29,30,31,32,33,35,36,37,38,39,40,42,43,44,45,46,47,48,49,50,51,52,53,
%U 54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71
%N Numbers n such that -1 is not a 4th power mod n.
%C Complement of A192453.
%t Table[If[Reduce[x^4==-1,Modulus->n]===False,n],{n,2,300}]//Union
%K nonn
%O 1,1
%A _José María Grau Ribas_, Jul 01 2011
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