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 A104071 #14 Nov 08 2023 12:43:09
%S A104071 29,31,43,59,283,1051,8219,16411,65563,1099511627803,2199023255579,
%T A104071 17592186044443,77371252455336267181195291,
%U A104071 1298074214633706907132624082305051
%N A104071 Primes of the form 2^k + 27.
%F A104071 a(n) = 2^A157007(n) + 27. - _Elmo R. Oliveira_, Nov 08 2023
%t A104071 a = Delete[Union[Flatten[Table[If [PrimeQ[2^n + 27] == True, 2^n + 27, 0], {n, 1, 400}]]], 1]
%o A104071 (Magma) [ a: n in [0..750] | IsPrime(a) where a is 2^n+27]; // _Vincenzo Librandi_, Nov 13 2010
%Y A104071 Cf. A000040, A157007.
%K A104071 nonn
%O A104071 1,1
%A A104071 _Roger L. Bagula_, Mar 02 2005