a(2)=4; thereafter a(n) = smallest number m such that a(n-1)+m = (a(n-1) followed by the leading digit of m).

A224755

a(2)=4; thereafter a(n) = smallest number m such that a(n-1)+m = (a(n-1) followed by the leading digit of m).

Terms

    a(0) =4a(1) =39a(2) =354a(3) =3189a(4) =28703a(5) =258329a(6) =2324963a(7) =20924669a(8) =188322022a(9) =1694898199a(10) =15254083792a(11) =137286754129

External references