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 A256123 #6 Apr 26 2023 11:53:15 %S A256123 1854811727,1988791547,2498711497,2866433161,3337303943,3514209079, %T A256123 5078536369,5856521807,6057449263,7402496771,8158654937,8426760781, %U A256123 8829158339,10337846809,11487954299,11867001431,12967520437,14336558143 %N A256123 Primes p such that all six iterations of the map p->2p+nextprime(p) give primes. %C A256123 First prime with 7 iterations all giving primes is a(36)=44439344567. %Y A256123 Subsequence of A255694. %K A256123 nonn %O A256123 1,1 %A A256123 _Zak Seidov_, Mar 15 2015