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 A170806 #19 Aug 06 2016 17:05:37 %S A170806 12,20,21,22,102,201,202,212,1002,1012,1021,1022,1102,1201,1202,2001, %T A170806 2002,2011,2012,2021,2022,2101,2102,2112,2122,2201,2202,2212,10002, %U A170806 10012,10021,10022,10112,10121,10122,10211,10212,10221,10222,11002,11102,11201 %N A170806 Primes in lunar arithmetic in base 3 written in base 3. %H A170806 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 A170806 <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a> %F A170806 a(n) = A007089(A130206(n)). - _R. J. Mathar_, Aug 06 2016 %Y A170806 Cf. A130206. %K A170806 nonn,base %O A170806 1,1 %A A170806 _N. J. A. Sloane_, Sep 30 2010