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 A176072 #7 Jul 18 2019 11:36:04 %S A176072 7,281,1602529 %N A176072 Primes of the form 3^k + 2^k + k + 1. %C A176072 The next term is too large to include here. %C A176072 281 = 3^5 + 2^5 + 5 + 1,.. %C A176072 The corresponding values of k are 1, 5, 13, 905, 5341, ... ; a(5) ~ 2.016...*10^2548. - _Amiram Eldar_, Jul 18 2019 %H A176072 Amiram Eldar, <a href="/A176072/b176072.txt">Table of n, a(n) for n = 1..4</a> %t A176072 Select[Array[3^#+2^#+#+1&,2*6! ],PrimeQ[ # ]&] %Y A176072 Cf. A061421 %K A176072 nonn,bref %O A176072 1,1 %A A176072 _Vladimir Joseph Stephan Orlovsky_, Apr 07 2010