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 A274022 #12 Jun 18 2025 11:24:31
%S A274022 5,7,19,65539
%N A274022 Primes of the form 2^(2^k) + 3.
%C A274022 Terms given correspond to n = 0, 1, 2, and 4.
%C A274022 Next term >= 2^2^28 + 3. - _Charles R Greathouse IV_, Jun 08 2016
%t A274022 Select[Table[2^(2^n) + 3, {n, 0, 15}], PrimeQ]
%o A274022 (Magma) [a: n in [0..10] | IsPrime(a) where a is 2^(2^n)+3];
%o A274022 (PARI) for(n=0,4, if(ispseudoprime(t=2^2^n+3), print1(t", "))) \\ _Charles R Greathouse IV_, Jun 08 2016
%Y A274022 Cf. A019434, A130730.
%Y A274022 Cf. similar sequences listed in A273547.
%K A274022 nonn
%O A274022 1,1
%A A274022 _Vincenzo Librandi_, Jun 07 2016