Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #2 Mar 30 2012 17:26:21
%S 1,3,5,7,9,31,51,53,71,73,75,91,93,95,97,531,731,751,753,931,951,953,
%T 971,973,975,7531,9531,9731,9751,9753,97531
%N Odd digits in decreasing order.
%C 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 Sort@Flatten@Table[FromDigits/@Subsets[Range[9,1,-2],{n}],{n,1,5}]
%Y Cf. A009993, A009995, A119253.
%K base,fini,full,nonn
%O 1,2
%A _Zak Seidov_, May 10 2006