0,1

It is extremely probable that a(n) = 0 for all n >= 42.

Table of n, a(n) for n=0..80.

Table[k=0; While[!Length[Union[IntegerDigits[k!*n!]]]==10, k++]; k, {n, 0, 60}]

Cf. A000142, A204598.

Sequence in context: A255228 A255221 A072135 * A010862 A291570 A141460

Adjacent sequences: A204630 A204631 A204632 * A204634 A204635 A204636

nonn,base

Michel Lagneau, Jan 17 2012

approved