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 A138941 #11 Jul 13 2025 11:07:22
%S A138941 6274633,3405994336744928448432949523054569,
%T A138941 469545242509890879708897137286442565790534241
%N A138941 Primes of the form (13^k - 3^k)/10.
%C A138941 The next term (a(4)) has 299 digits. - _Harvey P. Dale_, Dec 06 2017
%H A138941 Amiram Eldar, <a href="/A138941/b138941.txt">Table of n, a(n) for n = 1..5</a>
%t A138941 a={};Do[p=(13^n-3^n)/10;If[PrimeQ[p],AppendTo[a,p]],{n,1,16^2}];a
%t A138941 Select[Table[(13^n-3^n)/10,{n,300}],PrimeQ] (* _Harvey P. Dale_, Dec 06 2017 *)
%Y A138941 Cf. A128028.
%K A138941 nonn
%O A138941 1,1
%A A138941 _Vladimir Joseph Stephan Orlovsky_, May 16 2008