%I
%S 0,0,0,0,0,0,0,0,0,0,0,9,18,27,36,45,54,63,72,0,0,0,9,18,27,36,45,54,
%T 63,0,0,0,0,9,18,27,36,45,54,0,0,0,0,0,9,18,27,36,45,0,0,0,0,0,0,9,18,
%U 27,36,0,0,0,0,0,0,0,9,18,27,0,0,0,0,0,0,0,0,9,18,0,0,0,0,0,0,0,0,0,9,0,0
%N Difference between n and the largest number with the same digit set as n.
%t FromDigits[Sort[IntegerDigits[n], Greater]]  n (Rob Pratt)
%t Table[Max[FromDigits/@ Permutations[IntegerDigits[n]]]n, {n, 150}]
%K nonn,base
%O 1,12
%A _Zak Seidov_, Jun 29 2005
