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 A005621 M3270 #23 Jul 08 2025 16:32:10 %S A005621 1,4,6,7,9,13,21,46,71,109,168,265,417,562,1051,1677,2484,4053,6601, %T A005621 10738,17979,28997,46800,75573,120697,197306,318939,515665,830216, %U A005621 1343949,2181261,3528334,5698111,9233541,14938080 %N A005621 Spiral sieve using Fibonacci numbers. %D A005621 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A005621 H. W. Gould, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Scanned/12-4/gould.pdf">Some sequences generated by spiral sieving methods</a>, Fib. Quart., 12 (1974), 393-397. %H A005621 <a href="/index/Si#sieve">Index entries for sequences generated by sieves</a> %K A005621 nonn,easy %O A005621 1,2 %A A005621 _N. J. A. Sloane_ %E A005621 More terms from Chris Deugau (deugaucj(AT)uvic.ca), Dec 24 2005