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 A383445 #14 Apr 30 2025 12:42:58 %S A383445 0,3,1,5,9,15,10,16,14,17,23,21,24,22,28,31,29,36,30,35,37,43,41,47, %T A383445 42,48,54,49,55,61,56,62,67,63,68,66,71,75,80,76,81,79,82,89,91,88,90, %U A383445 92,99,93,98,100,105,111,106,112,110,113,124,122,125,123,126,128,121,127,133,138,134,139,137,147,150,148,146,149,153 %N A383445 Index of n in A377090, or -1 if n does not appear there. %C A383445 It is conjectured (see A377090) that every positive integer appears exactly once either here or in A383446. %H A383445 N. J. A. Sloane, <a href="/A383445/b383445.txt">Table of n, a(n) for n = 0..4996</a> %Y A383445 Cf. A377090, A383446. %K A383445 nonn %O A383445 0,2 %A A383445 _N. J. A. Sloane_, Apr 30 2025