%I A024361
%S A024361 0,0,1,1,1,0,1,1,1,0,1,2,1,0,2,1,1,0,1,2,2,0,1,2,1,0,1,2,1,0,1,1,2,
%T A024361 0,2,2,1,0,2,2,1,0,1,2,2,0,1,2,1,0,2,2,1,0,2,2,2,0,1,4,1,0,2,1,2,0,
%U A024361 1,2,2,0,1,2,1,0,2,2,2,0,1,2,1,0,1,4,2,0,2,2,1,0,2,2,2,0,2,2,1,0,2
%N A024361 Number of primitive Pythagorean triangles with leg n.
%C A024361 Consider primitive Pythagorean triangles (A^2 + B^2 = C^2, (A, B) = 1, 
               A <= B); sequence gives number of times AUB takes value n.
%C A024361 For n>1, a(n)=0 for n=A016825=2(mod 4). Also, number of ways of expressing 
               n as a difference of two coprime squares. - Lekraj Beedassy (blekraj(AT)yahoo.com), 
               Sep 28 2004
%H A024361 Ron Knott, <a href="http://www.mcs.surrey.ac.uk/Personal/R.Knott/Pythag/
               pythag.html">Pythagorean Triples and Online Calculators</a>
%H A024361 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               PythagoreanTriple.html">Link to a section of The World of Mathematics.</
               a>
%Y A024361 Cf. A024362, A046079.
%Y A024361 Cf. A020883; A020884.
%Y A024361 Sequence in context: A029296 A096419 A130182 this_sequence A135486 A030187 
               A117278
%Y A024361 Adjacent sequences: A024358 A024359 A024360 this_sequence A024362 A024363 
               A024364
%K A024361 nonn
%O A024361 1,12
%A A024361 David W. Wilson (davidwwilson(AT)comcast.net)