Prime factor of 300 000 000 000?

Question

I need to find out the prime factors of over 300 billion. I have a function that is adding to the list of them...very slowly! It has been running for about an hour now and i

Answer 1

$ time factor 300000000000 > /dev/null

real        0m0.027s
user        0m0.000s
sys         0m0.001s

You're doing something wrong if it's taking an hour. You might even have an infinite loop somewhere - make sure you're not using 32-bit ints.