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 A173974 #9 Aug 06 2019 11:19:43
%S A173974 2,8,14,26,84,574
%N A173974 Numbers k such that k^k+43 is prime.
%C A173974 a(7) > 3000. - _Daniel Starodubtsev_, Aug 06 2019
%e A173974 2^2 + 43 = 47, which is prime, so 2 is in the sequence.
%t A173974 f[n_]:=PrimeQ[n^n+43];lst={};Do[If[f[n],AppendTo[lst,n]],{n,6!}];lst
%o A173974 (PARI) is(n)=ispseudoprime(n^n+43) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y A173974 Cf. A100837, A100838, A100839.
%K A173974 nonn
%O A173974 1,1
%A A173974 _Vladimir Joseph Stephan Orlovsky_, Mar 03 2010