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 A118904 #6 Feb 16 2025 08:33:01 %S A118904 14,28,34,42,46,56,62,68,70,82,84,92,94,98,102,112,124,126,136,138, %T A118904 140,142,146,154,158,164,168,170,178,182,184,186,188,194,196,204,206, %U A118904 210,224,226,230,238,246,248,252,254,266,272,274,276,280,282,284,292,294 %N A118904 Perimeters of rectangles with integer sides and diagonal. %H A118904 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PythagoreanTriple.html">Pythagorean Triple</a> %F A118904 Twice A118905. %e A118904 14 = 2*(3+4) and 3^2+4^2=5^2. %Y A118904 Cf. A009096, A118902, A118903, A118905. %K A118904 nonn %O A118904 1,1 %A A118904 _Giovanni Resta_, May 05 2006