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 A247427 #6 Jan 05 2025 19:51:40 %S A247427 2,4,6,8,10,12,14,15,17,19,21,23,25,27,29,31,33,35,37,39,40,42,44,46, %T A247427 48,50,52,54,55,57,59,61,63,65,67,69,71,73,75,77,79,80,82,84,86,88,90, %U A247427 92,94,95,97,99,101,103,104,106,108,110,112,114,116,118,119 %N A247427 2n - m, where m is the largest integer such that A003249(m) <= n. %C A247427 This is the function named sigma in [Carlitz] (cf. Thm. 7.2). %H A247427 L. Carlitz, R. Scoville and T. Vaughan, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Scanned/11-4/carlitz.pdf">Some arithmetic functions related to Fibonacci numbers</a>, Fib. Quart., 11 (1973), 337-386. %F A247427 Definition of [Carlitz]: a(n) = A003254(A003247(n)). %K A247427 nonn %O A247427 1,1 %A A247427 _Eric M. Schmidt_, Sep 17 2014