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 A009096 #17 Jul 06 2025 11:24:38 %S A009096 12,24,30,36,40,48,56,60,60,70,72,80,84,84,90,90,96,108,112,120,120, %T A009096 120,126,132,132,140,144,144,150,154,156,160,168,168,168,176,180,180, %U A009096 180,182,192,198,200,204,208,210,210,216,220,224,228,234,240,240,240,240,252,252 %N A009096 Ordered perimeters of Pythagorean triangles, listed with multiplicity. %H A009096 Ron Knott, <a href="http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Pythag/pythag.html">Pythagorean Triples and Online Calculators</a> %H A009096 <a href="/index/Ps#PyTrip">Index entries related to Pythagorean Triples.</a> %F A009096 a(n) = A103605(3n) + A103605(3n-1) + A103605(3n-2). - _M. F. Hasler_, Jul 04 2025 %e A009096 The perimeters are listed with multiplicity, for example a(8) = a(9) = 60 = 15 + 20 + 25 = 10 + 24 + 26. - _M. F. Hasler_, Jul 04 2025 %Y A009096 Cf. A103605 (the corresponding triples), A024364 (perimeters of primitive Pythagorean triangles). %K A009096 nonn %O A009096 1,1 %A A009096 _David W. Wilson_ %E A009096 Name clarified by _M. F. Hasler_, Jul 04 2025