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 A274023 #15 Jun 18 2025 13:59:52
%S A274023 17,29,269,18446744073709551629
%N A274023 Primes of the form 2^(2^k) + 13.
%C A274023 Terms given correspond to k = 1, 2, 3 and 6.
%C A274023 Next term >= 2^2^39 + 13. - _Charles R Greathouse IV_, Jun 08 2016
%t A274023 Select[Table[2^(2^n) + 13, {n, 0, 15}], PrimeQ]
%o A274023 (Magma) [a: n in [0..10] | IsPrime(a) where a is 2^(2^n)+13];
%o A274023 (PARI) for(n=1,6, if(ispseudoprime(t=2^2^n+13), print1(t", "))) \\ _Charles R Greathouse IV_, Jun 08 2016
%Y A274023 Cf. A019434, A104067, A130730, A274022.
%Y A274023 Cf. similar sequences listed in A273547.
%K A274023 nonn
%O A274023 1,1
%A A274023 _Vincenzo Librandi_, Jun 07 2016