A108047 Concatenation of the previous pair of numbers, with the first two terms both 1.

1, 1, 11, 111, 11111, 11111111, 1111111111111, 111111111111111111111, 1111111111111111111111111111111111, 1111111111111111111111111111111111111111111111111111111, 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

Offset: 1

Author

Parthasarathy Nambi, Jun 01 2005

Keywords

• nonn
• easy
• base

Comments

The Fibonacci numbers, A000045, represented in base 1 (see A000042).

Examples

			The third term is 11 which is the concatenation of the first two terms 1 and 1.
		

Crossrefs

Column b=1 of A214326.

Column k=1 of A214679.

Cf. A037842, A131293.

Formula

a(n) = (10^A000045(n)-1)/9.

a(n) = A000042(A000045(n)).

Extensions

Edited by Jason Kimberley, Dec 15 2012