数学のやつ

hoge.php

<?php
$LIMIT = 10000;
$n = 15;
$z = false;
for($m = 1;$m < $LIMIT;++$m){
	for($p = 2;$p < $LIMIT;++$p){
		$f = false;
		for($k = 2;$k <= sqrt($p);++$k){
			if($p % $k === 0) $f = true;
		}
		if($f === false && $p + $n === $m * $m){
			echo $n . " + " . $p . " = " . $m * $m . "\n";
			$z = true;
		}
	}
}
if(!$z) echo $n . "\n";