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 A138943 #11 Jul 11 2025 08:50:39
%S A138943 19,313,1635972917889127228189253483929940713
%N A138943 Primes of the form (16^k - 3^k)/13.
%C A138943 The next term has 562 digits. - _Harvey P. Dale_, Mar 28 2013
%H A138943 Amiram Eldar, <a href="/A138943/b138943.txt">Table of n, a(n) for n = 1..4</a>
%F A138943 a(n) = A180845(A128030(n)). - _Amiram Eldar_, Jul 11 2025
%t A138943 a={};Do[p=(16^n-3^n)/13; If[PrimeQ[p], AppendTo[a,p]], {n,1,10^2}];a
%t A138943 Select[Table[(16^n-3^n)/13,{n,500}],PrimeQ] (* _Harvey P. Dale_, Mar 28 2013 *)
%Y A138943 Cf. A128030, A180845.
%K A138943 nonn
%O A138943 1,1
%A A138943 _Vladimir Joseph Stephan Orlovsky_, May 16 2008