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 A179687 #7 Jun 02 2025 03:02:11 %S A179687 3,5,7,19,27,37,47,53,67,95,101,103,107,131,149,173,181,191,227,239, %T A179687 263,293,311,317,349,359,367,373,383,419,461,463,479,509,547,557,587, %U A179687 613,619,647,653,677,701,743,751,773,787,821,841,863,887,947 %N A179687 a(n) = 2*q(n)-1 where q(n) is the sequence of records positions of A179686. %C A179687 The record positions are q(n) = 2, 3, 4, 10, 14, 19, 24, 27, 34,... %C A179687 Sequences A179382, A179383, A179480, A179481, A179686 and this sequence show that their terms depend on prime power factorization of 2*n-1. Nevertheless, this question yet is waiting its research. Most likely that almost all terms of this sequence are primes (27, 95, 841,... are not). %Y A179687 Cf. A179382, A179383, A179480, A179481, A179686 %K A179687 nonn %O A179687 1,1 %A A179687 _Vladimir Shevelev_, Jul 24 2010 %E A179687 Extended beyond a(7) by R. J. Mathar, Dec 04 2011