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 A104069 #23 Nov 08 2023 14:49:11
%S A104069 47,4127,68719476767,
%T A104069 3599131035634557106248430806148785487095757694641533306480604458089470064537190296255232548883112685719936728506816716098566612844395439751206812144692131084107807
%N A104069 Primes of the form 2^k + 31.
%C A104069 Associated values of k are 4, 12, 36, 540, 844, 1192, ... . - _M. F. Hasler_, Nov 13 2010
%F A104069 a(n) = 2^A247952(n) + 31. - _Elmo R. Oliveira_, Nov 08 2023
%t A104069 a = Delete[Union[Flatten[Table[If [PrimeQ[2^n + 31] == True, 2^n + 31, 0], {n, 1, 400}]]], 1]
%o A104069 (Magma) [a: n in [0..750] | IsPrime(a) where a is 2^n+31] // _Vincenzo Librandi_, Nov 13 2010
%o A104069 (PARI) for(n=0,999, ispseudoprime(p=2^n+31) & print1(p", ")) \\ _M. F. Hasler_, Nov 13 2010
%Y A104069 Cf. A000040, A247952 (associated values of k).
%K A104069 nonn
%O A104069 1,1
%A A104069 _Roger L. Bagula_, Mar 02 2005