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 A242201 #11 Sep 08 2022 08:46:08 %S A242201 1,2,7,12,25,44,219,252,507,1155,2259,2972,4584,12422,13905,75606 %N A242201 Numbers n such that n*8^n - 1 is prime. %H A242201 Steven Harvey, <a href="http://harvey563.tripod.com/GeneralizedWoodallPrimes.txt">Generalized Woodall Search</a> %t A242201 Select[Range[3000], PrimeQ[# 8^# - 1] &] %o A242201 (Magma) [n: n in [0..2000] | IsPrime(n*8^n-1)]; %o A242201 (PARI) is(n)=ispseudoprime(n*8^n-1) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A242201 Cf. similar sequences listed in A242200. %K A242201 nonn,more %O A242201 1,2 %A A242201 _Vincenzo Librandi_, May 09 2014 %E A242201 a(13)-a(16) from Harvey's list (see Links).