"Fibonacci Sequence IV"
Given the first few Fibonacci numbers:
How many digits are contained in the 1000th Fibonacci number?
Modify the loop from challenge 14 and this will be the easiest yet!
Awnser:
209
Source:
function solution(){ $prevno = 1; // no 1 $currno = 1; // no 2 for( $i = 1; $i < 1000; $i++ ){ $placeholder = bcadd($prevno, $currno); $prevno = $currno; $currno = $placeholder; } echo "".strlen($currno).""; }