Number of n-digit numbers with nonzero multiplicative digital root 7.

A051818

Number of n-digit numbers with nonzero multiplicative digital root 7.

Terms

    a(0) =1a(1) =3a(2) =14a(3) =86a(4) =666a(5) =6418a(6) =64079a(7) =597445a(8) =5116146a(9) =40671872a(10) =304752986a(11) =2187716324a(12) =15395364971a(13) =110611591118a(14) =866239098731

External references