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 A147669 #5 Aug 03 2025 13:21:00
%S A147669 13,127,543607,3183060102526390833854311,
%T A147669 44487435359130133495783012898708551,
%U A147669 418364165757172442919546303805118823151668308251259902807
%N A147669 Primes of the form 7^k-6^k.
%C A147669 7^2-6^2=49-36=13,...
%t A147669 lst={};Do[p=7^n-6^n;If[PrimeQ[p],AppendTo[lst,p]],{n,6!}];lst
%Y A147669 Cf. A062573
%K A147669 nonn
%O A147669 1,1
%A A147669 _Vladimir Joseph Stephan Orlovsky_, Nov 10 2008