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static bool isPrime(int i) { if ((n > 2 && (n & 1) == 0) // check is it even || n <= 1 //check for -ve || (n > 3 && (n % 3 == 0))) // check for 3 divisable false; int maxLookup = (int) Math.sqrt(n); for (int i = 3; (i+2) <= maxLookup; i = i + 6) if (n % (i+2) == 0 || n % (i+4) == 0) false; true; }