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 A159952 #13 Dec 13 2012 12:27:37 %S A159952 0,1,2,10,11,12,20,21,22,100,101,102,110,111,112,120,121,122,200,201, %T A159952 202,210,211,212,220,221,1000,1001,1002,1010,1011,1012,1020,1021,1022, %U A159952 1100,1101,1102,1110,1111,1112,1120,1121,1122,1200,1201,1202,1210,1211,1212 %N A159952 Skinny numbers (A061909) containing no 3's. %C A159952 a(n) first differs from A007089(n-1) at a(27) = 1000, which does not equal 222 = A007089(26). - _Jason Kimberley_, Dec 13 2012 %H A159952 <a href="/index/Ca#CARRYLESS">Index entries for sequences related to carryless arithmetic</a> %K A159952 nonn,base,easy %O A159952 1,3 %A A159952 _N. J. A. Sloane_, Jul 29 2010