tommy@wanda ~/euler $ time ./5.php
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 2
    [4] => 5
    [5] => 7
    [6] => 2
    [7] => 3
    [8] => 11
    [9] => 13
    [10] => 2
    [11] => 17
    [12] => 19
)
232792560
real    0m0.395s
user    0m0.350s
sys     0m0.040s
tommy@wanda ~/euler $