Number of n-digit numbers with nonzero multiplicative digital root 4.

A051815

Number of n-digit numbers with nonzero multiplicative digital root 4.

Terms

    a(0) =1a(1) =12a(2) =105a(3) =780a(4) =5452a(5) =39979a(6) =336081a(7) =3263355a(8) =34518027a(9) =372779338a(10) =3957184040a(11) =40729856248a(12) =406862880846

External references