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A096867 Records in A068189 (smallest number k such that n = product of nonzero digits of k, or 0 if no such k exists). 2

%I

%S 1,2,3,4,5,6,7,8,9,25,26,27,35,45,55,56,57,58,67,68,77,255,256,257,

%T 355,455,555,556,557,558,567,568,577,2555,2556,2557,3555,4555,5555,

%U 5556,5557,5558,5567,5568,5577,25555,25556,25557,35555,45555,55555,55556

%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.

%K nonn,base

%O 1,2

%A _Klaus Brockhaus_, Jul 13 2004

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Last modified November 29 23:37 EST 2020. Contains 338780 sequences. (Running on oeis4.)