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 A155802 #10 Jul 08 2025 16:19:16 %S A155802 3,5,7,15,65,105,135,155,235,249,1407,1745,30207,40407,68115 %N A155802 Numbers k such that (5^k + 2^k - 1)/12 is prime. %e A155802 Corresponding primes are: 11, 263, 6521, 2543134241, 225875452601146757084886003255695202165296363, 2054325274013051576593043138757255806440645138498014683534338706479543763. %e A155802 Other terms are too large to be presented. %Y A155802 Cf. A155588. %K A155802 nonn,more %O A155802 1,1 %A A155802 _Zak Seidov_, Jan 27 2009 %E A155802 a(11)-a(15) from _Michael S. Branicky_, Jul 08 2025