Answer Posted / slau

In PHP, translate C# yourself
//array for prime numbers
$primes=array(2); //speed trick - we know that 2 is prime
for ($i=3;$i<=5000;$i+=2) { //speed - check only odd numbers
//max. possible divisor for number
$maxdiv = sqrt($i);
for ($j=0; $j<count($primes); $j++) {
// if modulus = 0, number has divisor
if (0 == $i % $primes[$j]) {
break;
}
//if all possible prime divisors checked, add new prime
if ($primes[$j] > $maxdiv) {
$primes[] = $i;
echo "$i\n";
break;
}
}
}


not very brilliant, 10 mins for coding, but runs pretty fast

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