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 A172413 #21 Jun 13 2017 13:40:31
%S A172413 1,29,35,1309,84379
%N A172413 Positive numbers n such that 11^n + n + 1 is prime.
%C A172413 11^n + n + 1 for n = 84379 is a probable prime.
%C A172413 There are no further terms up to 100000.
%t A172413 Do[ If[PrimeQ[11^m + m + 1 ] , Print[m]], {m, 5000}]
%o A172413 (PARI) is(n)=ispseudoprime(11^n+n+1) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y A172413 Cf. A005808, A046867, A109076.
%K A172413 nonn
%O A172413 1,2
%A A172413 _Matevz Markovic_, Jun 30 2011