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gnieark 2015-11-22 22:16:01 +01:00
parent 67503e8691
commit cc3fbfc36a
1 changed files with 19 additions and 1 deletions
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euler25.php
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@ -4,5 +4,23 @@
* https://projecteuler.net/problem=25 * https://projecteuler.net/problem=25
*/ */
//see https://fr.wikipedia.org/wiki/Suite_de_Fibonacci#Avec_la_formule_de_Binet
echo intval((log(10)*999 + (log(5)/2) ) / log(1.61803398875)) +1; echo intval((log(10)*999 + (log(5)/2) ) / log(1.61803398875)) +1;
/*
Very long solution that didn't test :
$i=1;
$j=2;
$count=2;
while(strlen($i)<1000){
$new=gmp_add($i,$j);
$i=$j;
$j=$new;
$count++;
}
echo $count;
*/