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<?php function problem_3() { $task = 600851475143; $sqrt = ceil(sqrt($task)); if (0 === $sqrt % 2) { $sqrt++; } for ($i = $sqrt; $i >= 1; $i = $i - 2) { if (0 !== $task % $i) { continue; } if ($i === (int)gmp_nextprime($i - 1)) { return $i; } } return -1; } // echo problem_3(); // echo (int)gmp_nextprime(5000 -1);
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