This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A195999 #5 Mar 30 2012 18:57:49 %S A195999 3,17,17,43,11,19,81,33,57,131,27,193,73,121,267,99,43,353,209,451,83, %T A195999 163,561,201,321,683,123,99,41,289,457,339,57,617,59,227,451,179,513, %U A195999 291,67,89,649,723,283,107,443,121,531,411,137,131,97,177,179 %N A195999 Positive integers c for which there is a primitive (-2/3)-Pythagorean triple (a,b,c) satisfying a<=b. %C A195999 See A195770 for definitions of k-Pythagorean triple, primitive k-Pythagorean triple, and lists of related sequences. %t A195999 (See A195994.) %Y A195999 Cf. A195770, A195994, A195997, A195998. %K A195999 nonn %O A195999 1,1 %A A195999 _Clark Kimberling_, Sep 26 2011