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A196379 Positive integers a for which there is a primitive (-4)-Pythagorean triple (a,b,c) satisfying a<=b.

%I A196379 #5 Mar 30 2012 18:57:49
%S A196379 1,3,4,4,5,5,7,7,8,8,9,11,11,12,12,13,13,15,15,16,16,17,17,19,19,20,
%T A196379 20,20,20,21,21,23,23,24,24,25,28,28,28,28,29,31,32,32,33,35,35,35,36,
%U A196379 37,39,40,40,40,44,44,44,45,48,51,52,52,52,55,55,56,56
%N A196379 Positive integers a for which there is a primitive (-4)-Pythagorean triple (a,b,c) satisfying a<=b.
%C A196379 See A195770 for definitions of k-Pythagorean triple, primitive k-Pythagorean triple, and lists of related sequences.
%e A196379 Primitive (-4)-Pythagorean triples a,b,c;
%e A196379 c^2=a^2+b^2+k*a*b, where k=-4:
%e A196379 1,4,1
%e A196379 3,20,13
%e A196379 4,15,1
%e A196379 4,21,11
%e A196379 5,24,11
%e A196379 5,48,37
%e A196379 7,40,23
%e A196379 7,88,73
%e A196379 8,35,13
%e A196379 8,65,47
%t A196379 (See A196376.)
%Y A196379 Cf. A195770, A196376, A196380, A196381.
%K A196379 nonn
%O A196379 1,2
%A A196379 _Clark Kimberling_, Oct 01 2011