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 A140391 #6 Mar 13 2021 10:47:47 %S A140391 4,3,5,12,5,13,60,11,61,180,19,181,420,29,421,1740,59,1741,1860,61, %T A140391 1861,2520,71,2521,3120,79,3121,5100,101,5101,8580,131,8581,9660,139, %U A140391 9661,16380,181,16381,19800,199,19801,36720,271,36721,60900,349,60901,71820 %N A140391 Pythagorean triangle side lengths triples with two lengths prime. %C A140391 Or: consecutive triples of x=A067755(j), y=A048161(j), z=A067756(j), j>=1. %e A140391 Contains (x,y,z) = (4,3,5) with 4^2+3^2=5^2 and 3 and 5 prime, then (12,5,13) with 12^5+5^2=13^2 and 5 and 13 prime, then (60,11,61) with 60^2+11^2=61^2 etc. x^2+y^2=z^2 %K A140391 nonn,less %O A140391 1,1 %A A140391 _Juri-Stepan Gerasimov_, Jun 13 2008 %E A140391 Edited and extended by _R. J. Mathar_, Jun 17 2008