Total number of n-digit positive integers with multiplicative digital root value 4.

A263478

Total number of n-digit positive integers with multiplicative digital root value 4.

Terms

    a(0) =1a(1) =9a(2) =55a(3) =214a(4) =615a(5) =1451a(6) =3829a(7) =60180a(8) =939045a(9) =8732485a(10) =56961531a(11) =289887214a(12) =1229099287a(13) =4756606869a(14) =24218431805a(15) =233925901576

External references