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C++ prime number check

Katonkel on Feb 21, 2021

// 6k+-1 optimisation
bool is_prime6(int num) {
  int i;
  if (num == 1)
    return false;
  if (num <= 3)
    return true;
  if (num % 2 == 0 || num % 3 == 0)
    return false;
  if (num < 25)
    return true;
  for (i = 5; i * i <= num; i += 6)
    if (num % i == 0 || num % (i + 2) == 0)
      return false;
  return true;
}

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"C++ prime number check" Code Answer's