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 A171896 #13 Sep 12 2019 15:01:56 %S A171896 1,2,2,3,3,4,4,4,4,4,5,5,6,6,6,6,6,7,7,7,8,8,8,8,9,9,9,9,9,9,10,10,10, %T A171896 10,10,11,11,11,11,11,11,12,12,12,13,13,13,14,14,14,14,14,15,15,15,15, %U A171896 16,16,16,17,17,17,17,18,18,18,19,19,19,19,19,19,20,20,20,20 %N A171896 Number of 0's in first n terms of Van Eck's sequence (A181391). %C A171896 Initially, seems to be about 0.136 times n. Maybe constant times n/log(n)? It would be nice to know more. - _N. J. A. Sloane_, Oct 10 2017 %C A171896 a(10^12) = 90689534032. - _Benjamin Chaffin_, Sep 11 2019 %H A171896 N. J. A. Sloane, <a href="/A171896/b171896.txt">Table of n, a(n) for n = 1..10000</a> %H A171896 Benjamin Chaffin, <a href="/A171896/a171896.png">Plot of a(n)/n for the first 10^12 terms</a> %Y A171896 Essentially A171895 + 1. First differences give A171894. Cf. A181391. %K A171896 nonn %O A171896 1,2 %A A171896 _N. J. A. Sloane_, Oct 19 2010