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 A177224 #7 Jun 06 2021 09:02:31 %S A177224 13,609554401,109,193,51001,433,44937854708156010721,769 %N A177224 a(n) is the least prime of the form ((2n+1)^k - (2n-1)^k)/2. %C A177224 a(9) = (19^163 - 17^163)/2 is too large to include here. %C A177224 Corresponding values of k (odd primes) are listed in A122478. %F A177224 a(n) = ((2n+1)^A122478(n) - (2n-1)^A122478(n)) / 2. %Y A177224 Cf. A122478, A028491, A121877. %K A177224 hard,nonn %O A177224 1,1 %A A177224 _Alexander Adamchuk_, May 05 2010 %E A177224 Edited by _Max Alekseyev_, May 16 2010