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 A100407 #18 Dec 15 2023 13:53:25
%S A100407 1,3,737,1349
%N A100407 Numbers k such that k^k+2 is prime.
%C A100407 All terms are odd. Next term is greater than 3500. 1349^1349+2 is a probable prime with length 4223.
%C A100407 The next term, if it exists, is greater than 50000. - _Hugo Pfoertner_, Jun 28 2019
%C A100407 The next term, if it exists, is greater than 430000. - _Ryan Propper_, Dec 15 2023
%e A100407 737 is in the sequence because 737^737+2 is prime.
%t A100407 Do[If[PrimeQ[n^n+2], Print[n]], {n, 3500}]
%o A100407 (PARI) is(n)=ispseudoprime(n^n+2) \\ _Charles R Greathouse IV_, May 22 2017
%Y A100407 Cf. A100408.
%K A100407 more,nonn,hard
%O A100407 1,2
%A A100407 _Farideh Firoozbakht_, Nov 19 2004