数学のやつ 2

hoge2.php

<?php
$LIMIT = 500;
$array = [];
for($n = 1;$n < $LIMIT;++$n){
	$z = false;
	for($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";
				$z = true;
				break;
			}
		}
		if($z) break;
	}
	if(!$z) $array[] = $n;
}
echo "Done.";
print_r($array);