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 A242196 #19 Sep 08 2022 08:46:08 %S A242196 1,8,247,3610,4775,19789,187895 %N A242196 Numbers k such that k*12^k + 1 is prime. %H A242196 G. Loeh, <a href="http://guenter.loeh.name/gc/status.html">Generalized Cullen primes</a> %t A242196 Select[Range[2300], PrimeQ[# 12^# + 1] &] %o A242196 (Magma) [n: n in [0..2300] | IsPrime(n*12^n+1)] %o A242196 (PARI) is(n)=ispseudoprime(n*12^n+1) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A242196 Cf. similar sequences listed in A242176. %K A242196 nonn,more %O A242196 1,2 %A A242196 _Vincenzo Librandi_, May 08 2014 %E A242196 a(4)- a(7) from Loeh's list (see Links) - _Bruno Berselli_, May 08 2014