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 A171786 #13 Aug 06 2014 16:14:23 %S A171786 6,17,27,37,47,57,67,70,71,72,73,74,75,76,77,107,118,128,138,148,158, %T A171786 168,178,180,181,182,183,184,185,186,187,188,207,217,228,238,248,258, %U A171786 268,278,280,281,282,283,284,285,286,287,288,307,317,327 %N A171786 Numbers of rank 3 in the poset of lunar numbers. %H A171786 David Applegate and N. J. A. Sloane, <a href="/A171786/b171786.txt">Table of n, a(n) for n = 1..17994</a> %H A171786 D. Applegate, M. LeBrun and N. J. A. Sloane, <a href="http://arxiv.org/abs/1107.1130">Dismal Arithmetic</a> [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing] %H A171786 <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a> %K A171786 nonn,base %O A171786 1,1 %A A171786 _David Applegate_ and _N. J. A. Sloane_, Oct 14 2010