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 A124583 #18 Jan 25 2022 13:05:30 %S A124583 89,113,139,181,199,211,241,283,293,317,337,359,389,401,409,421,449, %T A124583 467,479,491,509,523,547,577,619,631,661,683,691,701,709,719,743,761, %U A124583 773,787,797,811,829,839,863,887,911,919,929,953,983,997,1021,1039,1051,1069,1109 %N A124583 Duplicate of A083371. %K A124583 dead %O A124583 1,1