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 A138958 #9 Jul 27 2025 00:22:42
%S A138958 31,991,1608145354351
%N A138958 Primes of the form (6^k + 5^k)/11.
%C A138958 The next term has 308 digits. - _Harvey P. Dale_, Sep 16 2022
%H A138958 Amiram Eldar, <a href="/A138958/b138958.txt">Table of n, a(n) for n = 1..6</a>
%t A138958 a={}; Do[p=(6^n+5^n)/11; If[PrimeQ[p], AppendTo[a, p]], {n, 1, 12^2}];a
%t A138958 Select[Table[(6^n+5^n)/11,{n,20}],PrimeQ] (* _Harvey P. Dale_, Sep 16 2022 *)
%Y A138958 Cf. A128336.
%K A138958 nonn,hard
%O A138958 1,1
%A A138958 _Vladimir Joseph Stephan Orlovsky_, May 16 2008