A113765 Define the first two terms to be 1 and 7. All the other terms are obtained by concatenating the two previous terms.

1, 7, 17, 717, 17717, 71717717, 1771771717717, 717177171771771717717, 1771771717717717177171771771717717, 7171771717717717177171771771717717717177171771771717717

Offset: 0

Author

Parthasarathy Nambi, Jan 18 2006

Keywords

• nonn
• base

Comments

a(n) has Fibonacci(n) digits and the sum of all digits is given by Fibonacci(n-2)+7*Fibonacci(n-1) for all n>4. - Stefan Steinerberger, Jan 21 2006

Examples

			The third term is 17 and it is obtained by concatenating the two previous terms 1 and 7.
		

Crossrefs

Cf. A008352, A113526.

Cf. A000045 - the Fibonacci numbers.

Extensions

More terms from Stefan Steinerberger, Jan 21 2006