4 ms·

Yes, there can.

• tom-lord 12y ago
  The point is that if there is a prime factor greater than sqrt(n), then your will have already found its co-factor by then.
  • jdmichal 12y ago
    Correct. I misspoke. I should have said, A better implementation will only check to sqrt(n), as there can be no prime factor greater than that without there also being a prime factor lower than that.