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 A307747 #7 Apr 27 2019 05:26:52 %S A307747 1,2,3,4,5,7,6,8,9,10,11,13,12,14,15,17,19,16,18,23,29,20,21,24,25,26, %T A307747 27,22,28,30,31,37,35,33,41,43,47,53,49,39,45,32,34,36,38,59,61,55,51, %U A307747 57,56,58,67,71,62,63,65,64,46,48,40,44,42,50,52,54,73 %N A307747 Terms in A307720 in order of appearance. %H A307747 Rémy Sigrist, <a href="/A307747/b307747.txt">Table of n, a(n) for n = 1..10000</a> %H A307747 Rémy Sigrist, <a href="/A307747/a307747.png">Colored scatterplot of the first 10000 terms</a> (red pixels correspond to prime terms) %H A307747 Rémy Sigrist, <a href="/A307747/a307747.txt">C++ program for A307747</a> %e A307747 The first terms of A307720 are (with periodic parts in parentheses): %e A307747 1,1,2,(1,3)*2,(2,2)*2,(2,3)*3,(3,3)*4,3,(4,2)*4,(4,3)*6,(5,1)*3,(7,1)*3,7,... %e A307747 * * * * * * %e A307747 The terms marked with a star give the sequence: %e A307747 1, 2, 3, 4, 5, 7,... %o A307747 (C++) See Links section. %Y A307747 Cf. A307720. %K A307747 nonn %O A307747 1,2 %A A307747 _Rémy Sigrist_, Apr 26 2019