A196372 - OEIS

%I #5 Mar 30 2012 18:57:49

%S 1,3,3,5,7,7,8,8,9,9,11,11,13,13,15,15,16,16,17,17,19,19,21,21,21,21,

%T 23,23,24,24,24,24,25,27,29,31,32,32,33,33,33,35,37,39,39,39,40,40,41,

%U 43,45,47,48,48,48,48,49,51,51,51,53,55,56,56,56,57,57,57

%N Positive integers a for which there is a primitive (-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 (-3)-Pythagorean triples a,b,c;

%e c^2=a^2+b^2-3*a*b:

%e 1,3,1

%e 3,8,1

%e 3,16,11

%e 5,39,31

%e 7,24,11

%e 7,72,61

%e 8,21,1

%e 8,33,19

%e 9,35,19

%e 9,115,101

%t (See A196369.)

%Y Cf. A195770, A196369, A196373, A196374.

%K nonn

%O 1,2

%A _Clark Kimberling_, Oct 01 2011