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 A153602 #8 May 12 2021 01:44:23 %S A153602 3,5,7,11,13,17,31,43,73,127,151,241,257,331,683,2731,5419,8191,43691, %T A153602 61681,65537,131071,174763,262657,524287,599479,2796203,15790321, %U A153602 18837001,22366891,715827883,2147483647,4278255361,4562284561 %N A153602 Primes in A153601. %Y A153602 Cf. A153443, A153601. %K A153602 nonn %O A153602 1,1 %A A153602 _Artur Jasinski_, Dec 29 2008 %E A153602 Edited by _N. J. A. Sloane_, Jan 16 2009