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 0,2,4,6,8,20,40,42,60,62,64,80,82,84,86,420,620,640,642,820,840,842,
%T 860,862,864,6420,8420,8620,8640,8642,86420
%N Numbers with even decimal digits in decreasing order.
%C This is the complete list of all 31 such numbers. Cf. A119260 Even decimal digits in increasing order, A119253 Odd digits in increasing order, A119252 Odd digits in decreasing order, A009993 Digits in increasing order, A009995 Digits in decreasing order.
%t Sort@Flatten@Table[FromDigits/@Subsets[Range[8,0,-2],{n}],{n,5}]
%Y Cf. A009993, A009995, A119252, A119253, A119260.
%K base,fini,full,nonn
%O 1,2
%A _Zak Seidov_, May 11 2006