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 A242199 #26 Sep 08 2022 08:46:08 %S A242199 1,3,55,81,223,1227,3012,3301 %N A242199 Numbers k such that k*16^k + 1 is prime. %H A242199 G. Loeh, <a href="http://guenter.loeh.name/gc/status.html">Generalized Cullen primes</a> %t A242199 Select[Range[2000], PrimeQ[# 16^# + 1] &] %o A242199 (Magma) [n: n in [0..2000] | IsPrime(n*16^n+1)]; %o A242199 (Sage) [n for n in (1..2000) if is_prime(n*16^n + 1)] # _Bruno Berselli_, May 09 2014 %o A242199 (PARI) is(n)=ispseudoprime(n*16^n+1) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A242199 Cf. similar sequences listed in A242176. %K A242199 nonn,more %O A242199 1,2 %A A242199 _Vincenzo Librandi_, May 08 2014 %E A242199 a(7)-a(8) from Loeh's list (see Links)