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@ 2014-05-17T22:34:39Z

<?php

function isPrime($number) {
    $max = floor(sqrt($number));
    for ($i=1; $i < $max; $i++) {
		if ($number % $i == 0)
            return false;
    }
    return true;
}

do {
    $i = mt_rand(100, 999);
} while ( ! isPrime($i) );

var_dump($i);

Output
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Output for 7.0.20, 7.1.5 - 7.1.10, 7.2.0: Process exited with code 137.

preferences:dark modelive preview

61.33 ms | 401 KiB | 11 Q