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 A370659 #6 Feb 28 2024 08:08:51 %S A370659 1,3,67,247,471,1027,6883,11673 %N A370659 Numbers k such that (4^k + 4*k)/4 is prime. %C A370659 If it exists, a(9) > 75000. %o A370659 (PARI) is(n) = ispseudoprime(4^(n-1)+n) %Y A370659 Cf. A158879, A221906. %K A370659 nonn,hard,more %O A370659 1,2 %A A370659 _Hugo Pfoertner_, Feb 27 2024