a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with nine times its value.

A061587

a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with nine times its value.

Terms

    a(0) =1a(1) =9a(2) =81a(3) =729a(4) =631881a(5) =5427972729

External references