%N Records in A068189 (smallest number k such that n = product of nonzero digits of k, or 0 if no such k exists).
%C Numbers n such that A068189(n) is a record are given in A096868.
%F A007954(a(n)) = A002473(n). - _Charles R Greathouse IV_, Sep 29 2013
%e Product of nonzero digits of 257 is 70, for n < 70 the smallest number k such that n = product of nonzero digits of k (or 0 if no such k exists) is at most 256, hence 257 is a record.
%Y Cf. A068189, A096868.
%A _Klaus Brockhaus_, Jul 13 2004