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 A161558 #5 Apr 05 2019 09:29:45
%S A161558 31,271,2311,94151567431,847322163871,450284043329950831,
%T A161558 239299329793567483011391,
%U A161558 13915193059764305948125655305497609574930528737031,123329495011708990974900261530856061081804307325717309329809036625289391
%N A161558 Primes of form 2^k+3^k-4.
%C A161558 Generated by k = 3, 5, 7, 23, 25, 37, 49, 103, 149, 211,....
%t A161558 lst={};Do[If[PrimeQ[p=2^n+3^n-4],AppendTo[lst,p]],{n,6!}];lst
%t A161558 Select[Table[2^k+3^k-4,{k,200}],PrimeQ] (* _Harvey P. Dale_, Apr 05 2019 *)
%Y A161558 Cf. A082101
%K A161558 nonn
%O A161558 1,1
%A A161558 _Vladimir Joseph Stephan Orlovsky_, Jun 13 2009
%E A161558 Comment added by _R. J. Mathar_, Oct 04 2009
%E A161558 One more term (a(9)) from _Harvey P. Dale_, Apr 05 2019