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 A242198 #19 Sep 08 2022 08:46:08 %S A242198 8,14,44,154,274,694,17426,59430 %N A242198 Numbers k such that k*15^k + 1 is prime. %H A242198 G. Loeh, <a href="http://guenter.loeh.name/gc/status.html">Generalized Cullen primes</a> %t A242198 Select[Range[2000], PrimeQ[# 15^# + 1] &] %o A242198 (Magma) [n: n in [0..2500] | IsPrime(n*15^n+1)]; %o A242198 (PARI) is(n)=ispseudoprime(n*15^n+1) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A242198 Cf. similar sequences listed in A242176. %K A242198 nonn,more %O A242198 1,1 %A A242198 _Vincenzo Librandi_, May 08 2014 %E A242198 a(7)-a(8) from Loeh's list (see Links)