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 A213530 #7 Feb 04 2017 01:21:14 %S A213530 6,71,686,6598,63449,614400,5952657,58088295,568932663,5588087493, %T A213530 54968844332,541664112990 %N A213530 Number of k < 10^n such that A047988(k) = 1. %D A213530 Thomas Kantke, Mathematische Unterhaltungen, in: Spektrum der Wissenschaft 4/1993, p. 11-13. %D A213530 Thomas Kantke, Das Spiel Minimum, in: Spektrum der Wissenschaft Spezial Physik - Mathematik - Technik 2/2012, pp. 57-66. %Y A213530 Cf. A047984, A047988, A212524, A213531, A213532, A213533. %K A213530 nonn %O A213530 1,1 %A A213530 _Martin Renner_, Jun 13 2012