## Pandigital Fibonacci ends

### Problem 104

Published on Friday, 9th September 2005, 06:00 pm; Solved by 7958

The Fibonacci sequence is defined by the recurrence relation:

> Fn = Fn1 + Fn2, where F1 = 1 and F2 = 1.

It turns out that F541, which contains 113 digits, is the first Fibonacci number for which the last nine digits are 1-9 pandigital (contain all the digits 1 to 9, but not necessarily in order). And F2749, which contains 575 digits, is the first Fibonacci number for which the first nine digits are 1-9 pandigital.

Given that Fk is the first Fibonacci number for which the first nine digits AND the last nine digits are 1-9 pandigital, find k.