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 A226249 #8 Jul 17 2025 17:17:42 %S A226249 2,3,5,7,9,10,12,13,15,17,18,20,22,24,25,27,29,31,32,34,35,37,39,41, %T A226249 42,44,45,47,49,50,52,54,56,57,59,60,62,64,65,67,69,71,72,74,76,78,79, %U A226249 81,82,84,86,87,89,91,93,94,96,98,100,101,103,104,106,108 %N A226249 Positions of nonpositive numbers in the ordering of the rational numbers at A226247. %C A226249 The rational numbers are ordered as a sequence S'' described at A226247. %H A226249 Clark Kimberling, <a href="/A226249/b226249.txt">Table of n, a(n) for n = 1..350</a> %F A226249 a(n) = A005374(n) + n. - _Alan Michael Gómez Calderón_, Jul 16 2025 %e A226249 The positions 1,2,3,5,6,8,9,11,12,... are read from this ordering: %e A226249 0/1, 1/1, 2/1, -1/1, 3, -1/2, 4/1, -1/3, 1/2, 5, -1/4, 2/3, 3/2, -2, ... %t A226249 (See A226247.) %Y A226249 Cf. A005374, A226247. %K A226249 nonn,easy %O A226249 1,1 %A A226249 _Clark Kimberling_, Jun 01 2013