Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #18 Sep 08 2022 08:46:08
%S 5,17,23,1911,20855,35945,42816
%N Numbers k such that k*8^k + 1 is prime.
%H G. Loeh, <a href="http://guenter.loeh.name/gc/status.html">Generalized Cullen primes</a>
%t Select[Range[2000], PrimeQ[# 8^# + 1] &]
%o (Magma) [n: n in [0..2000] | IsPrime(n*8^n+1)];
%o (PARI) is(n)=ispseudoprime(n*8^n+1) \\ _Charles R Greathouse IV_, May 22 2017
%Y Cf. similar sequences listed in A242176.
%K nonn,more
%O 1,1
%A _Vincenzo Librandi_, May 08 2014
%E a(5)-a(7) from Loeh's list (see Links) - _Bruno Berselli_, May 08 2014