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 A066775 #10 Feb 01 2023 08:17:46 %S A066775 19,53,61,101,107,251,269,311,347,419,499,521,547,563,587,673,677,691, %T A066775 877,937,953,1031,1061,1087,1229,1249,1259,1427,1433,1693,1733,1753, %U A066775 1777,1831 %N A066775 Primes p such that 2*p^2 is not in A066721. %H A066775 David Applegate, <a href="/A066721/a066721.txt">First 10000 terms of A066721 and their factorizations</a> %K A066775 nonn,more %O A066775 1,1 %A A066775 _David Applegate_, _N. J. A. Sloane_, Jan 18 2002