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 A179516 #4 Dec 30 2023 21:42:27 %S A179516 73,75,79,85,99,127,201,425,1253,5199,29945,229823,2275065,28132841, %T A179516 423135497,7573775211,158441583469,3816126076107,104494456797095 %N A179516 a(1) = 73, a(n) = prime(a(n-1)) - 4*a(n-1). %t A179516 NestList[ Prime@# - 4# &, 73, 18] %Y A179516 Cf. A007097, A074271, A179274, A179511, A179512, A179513, A179514, A179515, A179517, A179518. %K A179516 nonn %O A179516 1,1 %A A179516 _Robert G. Wilson v_, Jul 17 2010