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 A024354 #11 Jan 21 2020 12:16:55 %S A024354 4,12,15,21,24,35,40,45,55,56,60,63,72,77,80,84,91,99,105,112,117,120, %T A024354 132,140,143,144,153,156,165,168,171,176,180,187,195,208,209,220,221, %U A024354 224,231,240,247,252,253,255,260,264,272,273,275,285,288,299,304,308 %N A024354 Consider primitive Pythagorean triangles (A^2 + B^2 = C^2, (A, B) = 1, A <= B); sequence gives values of B, sorted and duplicates removed (first differs from A020883 at 420). %H A024354 Ray Chandler, <a href="/A024354/b024354.txt">Table of n, a(n) for n = 1..10000</a> %H A024354 Ron Knott, <a href="http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Pythag/pythag.html">Pythagorean Triples and Online Calculators</a> %Y A024354 Cf. A020883. %K A024354 nonn %O A024354 1,1 %A A024354 _David W. Wilson_