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 A162672 #31 Aug 06 2014 17:24:02 %S A162672 0,11,12,13,14,15,16,17,18,19,110,111,112,113,114,115,116,117,118,119, %T A162672 120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136, %U A162672 137,138,139,140,141,142,143,144,145,146,147,148,149,150 %N A162672 Lunar product 19*n. %C A162672 Since 19 is the smallest lunar prime, this is a kind of lunar analog of the even numbers. %C A162672 As the b-file shows, this sequence is not monotonic and contains repetitions. %H A162672 N. J. A. Sloane, <a href="/A162672/b162672.txt">Table of n, a(n) for n = 0..10000</a> %H A162672 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] %F A162672 For a two-digit number n, the lunar product 19*n is obtained by putting a 1 in front of n. %e A162672 19 * 3 = 13, so 13 is a member. 1109 has just two divisors, 9 and 109, so 1109 is not a member. %Y A162672 Cf. A087062, A078645. %K A162672 nonn,base %O A162672 0,2 %A A162672 Emilie Hogan, Dennis Hou, Kellen Myers and _N. J. A. Sloane_, Apr 09 2010 %E A162672 Entry revised by _N. J. A. Sloane_, May 28 2011, to correct errors in some of the comments