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 A309422 #9 Aug 04 2019 04:41:24 %S A309422 54,3076,11796 %N A309422 Numbers k such that 7^k + k^7 is prime. %C A309422 a(4) > 110000. %Y A309422 Cf. A001596, A114974, A309421. %K A309422 nonn,bref,more,hard %O A309422 1,1 %A A309422 _Hugo Pfoertner_, Jul 30 2019