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 A242178 #18 Sep 08 2022 08:46:08 %S A242178 5,17,23,1911,20855,35945,42816 %N A242178 Numbers k such that k*8^k + 1 is prime. %H A242178 G. Loeh, <a href="http://guenter.loeh.name/gc/status.html">Generalized Cullen primes</a> %t A242178 Select[Range[2000], PrimeQ[# 8^# + 1] &] %o A242178 (Magma) [n: n in [0..2000] | IsPrime(n*8^n+1)]; %o A242178 (PARI) is(n)=ispseudoprime(n*8^n+1) \\ _Charles R Greathouse IV_, May 22 2017 %Y A242178 Cf. similar sequences listed in A242176. %K A242178 nonn,more %O A242178 1,1 %A A242178 _Vincenzo Librandi_, May 08 2014 %E A242178 a(5)-a(7) from Loeh's list (see Links) - _Bruno Berselli_, May 08 2014