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 A242197 #17 Sep 08 2022 08:46:08 %S A242197 3,5,6,9,33,45,243,252,1798,2429,5686,12509,42545 %N A242197 Numbers k such that k*14^k + 1 is prime. %H A242197 G. Loeh, <a href="http://guenter.loeh.name/gc/status.html">Generalized Cullen primes</a> %t A242197 Select[Range[2000], PrimeQ[# 14^# + 1] &] %o A242197 (Magma) [n: n in [0..2000] | IsPrime(n*14^n+1)]; %o A242197 (PARI) is(n)=ispseudoprime(n*14^n+1) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A242197 Cf. similar sequences listed in A242176. %K A242197 nonn,more %O A242197 1,1 %A A242197 _Vincenzo Librandi_, May 08 2014 %E A242197 a(10)-a(13) from Loeh's list (see Links) - _Bruno Berselli_, May 08 2014