Few more challenges on ProjectEuler

ProjectEuler/027/problem27.php

@@ -0,0 +1,30 @@
+<?php
+function is_prime($prime) {  
+    if($prime < 1)
+    { 
+        return false;
+    }
+	if($prime == 1) 
+		return true;
+	if($prime == 2)
+		return true;
+    $sqrt = sqrt($prime);
+    for ($i = 3; $i <= $sqrt; $i+=2){
+        if ($prime%$i == 0) return false; 
+    } 
+    return true; 
+} 
+$high = 0;
+$max_primes = 0;
+for($a=-999; $a<1000; $a++) {
+	for($b=-999; $b<1000; $b=$b+2) {
+		$n=0;
+		while(is_prime($n*$n + $a * $n + $b)) {
+            $n++;
+                if($n > $max_primes) {
+                    $max_primes = $n;
+                    echo "max: $n a: $a b: $b\n";
+            }
+		}
+	}
+}