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%I #5 Mar 30 2012 18:57:49
%S 4,5,7,9,10,11,13,15,16,17,18,19,21,22,23,24,25,26,27,27,28,29,31,33,
%T 34,35,36,38,39,41,42,45,45,47,50,51,54,54,57,60,62,63,63,66,70,72,74,
%U 75,81,85,86,90,90,92,98,99,102,112,115,116,117,126,126,130,133
%N Positive integers a for which there is a primitive (2/3)-Pythagorean triple (a,b,c) satisfying a<=b.
%C See A195770 for definitions of k-Pythagorean triple, primitive k-Pythagorean triple, and lists of related sequences.
%e Primitive (2/3)-Pythagorean triples
%e (c^2=a^2+b^2+k*a*b, where k=2/3):
%e 4,9,11
%e 5,6,9
%e 7,30,33
%e 9,14,19
%e 10,63,67
%e 11,36,41
%e 13,108,113
%e 15,44,51
%e 16,165,171
%e 17,90,97
%t (See A196001.)
%Y Cf. A195770, A196001, A196005, A196006.
%K nonn
%O 1,1
%A _Clark Kimberling_, Sep 26 2011
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