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Link: http://codepad.org/R9l8wBuv    [ raw code | output | fork ]

PHP, pasted on Mar 2:
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<?php
$number = 600851475143;
$primes = array( 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97);

    foreach($primes as $key=>$value) {    
        if($number % $value == 0 ) {echo $value; break; }
    }


?>


Output:
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