A243035 Number of entries of length n in A240601.

10, 9, 90, 9, 90, 90, 900, 9, 90, 90, 900, 90, 900, 900, 9000, 9, 90, 90, 900, 90, 900, 900, 9000, 90, 900, 900, 9000, 900, 9000, 9000, 90000, 9, 90, 90, 900, 90, 900, 900, 9000, 90, 900, 900, 9000, 900, 9000, 9000, 90000, 90, 900, 900, 9000, 900, 9000, 9000

Offset: 1

Author

Lior Manor, May 29 2014

Keywords

• nonn
• base

Comments

For n>0, a(2^n) = 9.

For any base b, a(1) = b, a(2) = b-1, a(3) = b*(b-1), for m>1, a(2m) = a(m), a(2m+1) = b*a(m).

For any base b, a(n) = (b-1)*b^(A000120(n)-1).

Crossrefs

Cf. A240601, A243036, A000120.

Formula

a(1) = 10, a(2) = 9, a(3) = 90, For m>1, a(2m) = a(m), a(2m+1) = 10*a(m).

a(n) = 9*10^(A000120(n)-1).