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%I #14 Nov 08 2023 12:12:44
%S 31,151,549755813911,604462909807314587353111
%N Primes of the form 2^k + 23.
%H Vincenzo Librandi, <a href="/A176922/b176922.txt">Table of n, a(n) for n = 1..8</a>
%F a(n) = 2^A057203(n) + 23. [_R. J. Mathar_, Jun 18 2010]
%t Select[Table[2^n + 23, {n, 0, 750}], PrimeQ] (* _Vincenzo Librandi_ Jan 02 2014 *)
%o (Magma) [a: n in [0..750] | IsPrime(a) where a is 2^n+23];
%Y Cf. A000040, A057203.
%K nonn
%O 1,1
%A _Vincenzo Librandi_, Apr 29 2010
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