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 A195880 #5 Mar 30 2012 18:57:48 %S A195880 3,16,6,14,9,32,16,90,12,48,15,28,91,42,224,18,64,16,102,21,32,57,180, %T A195880 42,80,418,24,55,30,176,27,55,96,299,130,672,30,56,182,22,48,112,270, %U A195880 33,84,145,448,192,36,128,70,384,32,39,119,204,627,144,266,42 %N A195880 Positive integers b for which there is a (1/2)-Pythagorean triple (a,b,c) satisfying a<=b. %C A195880 See A195770 for definitions of k-Pythagorean triple, primitive k-Pythagorean triple, and lists of related sequences. %t A195880 (See A195879.) %Y A195880 Cf. A195770, A195879, A195881, A195882. %K A195880 nonn %O A195880 1,1 %A A195880 _Clark Kimberling_, Sep 25 2011