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

0,2

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

Links

Table of n, a(n) for n=0..9.

Example

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.

Sequence in context: A089563 A159028 A102266 * A269447 A013540 A153375

Adjacent sequences: A113762 A113763 A113764 * A113766 A113767 A113768

Keyword

nonn,base

Author

Parthasarathy Nambi, Jan 18 2006

Extensions

More terms from Stefan Steinerberger, Jan 21 2006

Status

approved