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 A118839 #6 Feb 16 2025 08:33:01 %S A118839 2,11,17,29,199,521,3571,9349,103681,3010349,54018521,370248451, %T A118839 6643838879,10749957121,119218851371,5600748293801,688846502588399, %U A118839 32361122672259149,115561578124838522881,412670427844921037470771 %N A118839 Primes corresponding to the indices of A059791. %H A118839 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Phi-Prime.html">Phi-Prime</a> %K A118839 nonn %O A118839 1,1 %A A118839 _Eric W. Weisstein_, May 01 2006