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 A242202 #12 Sep 08 2022 08:46:08 %S A242202 10,58,264,1568,4198,24500 %N A242202 Numbers n such that n*9^n - 1 is prime. %H A242202 Steven Harvey, <a href="http://harvey563.tripod.com/GeneralizedWoodallPrimes.txt">Generalized Woodall Search</a> %t A242202 Select[Range[2000], PrimeQ[# 9^# - 1] &] %o A242202 (Magma) [n: n in [0..2000] | IsPrime(n*9^n-1)]; %o A242202 (PARI) is(n)=ispseudoprime(n*9^n-1) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A242202 Cf. similar sequences listed in A242200. %K A242202 nonn,more %O A242202 1,1 %A A242202 _Vincenzo Librandi_, May 09 2014 %E A242202 a(5)-a(6) from Harvey's list (see Links).