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 A119252 #2 Mar 30 2012 17:26:21
%S A119252 1,3,5,7,9,31,51,53,71,73,75,91,93,95,97,531,731,751,753,931,951,953,
%T A119252 971,973,975,7531,9531,9731,9751,9753,97531
%N A119252 Odd digits in decreasing order.
%C A119252 There is a full list of 31 such numbers. Cf. A119253 Odd digits in increasing order, A009993 Digits in increasing order, A009995 Digits in decreasing order.
%t A119252 Sort@Flatten@Table[FromDigits/@Subsets[Range[9,1,-2],{n}],{n,1,5}]
%Y A119252 Cf. A009993, A009995, A119253.
%K A119252 base,fini,full,nonn
%O A119252 1,2
%A A119252 _Zak Seidov_, May 10 2006