a(n) contains n digits (either '4' or '9') and is divisible by 2^n.

A053333

a(n) contains n digits (either '4' or '9') and is divisible by 2^n.

Terms

    a(0) =4a(1) =44a(2) =944a(3) =4944a(4) =94944a(5) =994944a(6) =4994944a(7) =94994944a(8) =494994944a(9) =9494994944a(10) =49494994944a(11) =449494994944

External references