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 A273811 #8 Sep 08 2022 08:46:17
%S A273811 809,821,1061,4294968101,18446744073709552421
%N A273811 Primes of the form 2^(2^n) + 805.
%C A273811 Terms given correspond to n = 1, 2, 3, 5 and 6.
%C A273811 Next term >= 2^2^25 + 805. - _Charles R Greathouse IV_, Jun 07 2016
%t A273811 Select[Table[2^(2^n) + 805, {n, 0, 15}], PrimeQ]
%o A273811 (Magma) [a: n in [0..16] | IsPrime(a) where a is 2^(2^n)+805];
%o A273811 (PARI) for(n=1,6, if(ispseudoprime(t=2^2^n+805), print1(t", "))) \\ _Charles R Greathouse IV_, Jun 07 2016
%Y A273811 Cf. similar sequences listed in A273547.
%K A273811 nonn
%O A273811 1,1
%A A273811 _Vincenzo Librandi_, Jun 03 2016