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 A273805 #7 Sep 08 2022 08:46:17
%S A273805 347,587,65867,4294967627,18446744073709551947
%N A273805 Primes of the form 2^(2^n) + 331.
%C A273805 Terms given correspond to n = 2, 3, 4, 5 and 6.
%C A273805 Next term >= 2^2^30 + 331. - _Charles R Greathouse IV_, Jun 07 2016
%t A273805 Select[Table[2^(2^n) + 331, {n, 0, 15}], PrimeQ]
%o A273805 (Magma) [a: n in [0..16] | IsPrime(a) where a is 2^(2^n)+331];
%o A273805 (PARI) for(n=1,6, if(ispseudoprime(t=2^2^n+331), print1(t", "))) \\ _Charles R Greathouse IV_, Jun 07 2016
%Y A273805 Cf. similar sequences listed in A273547.
%K A273805 nonn
%O A273805 1,1
%A A273805 _Vincenzo Librandi_, Jun 02 2016