JOIN THE HUNT!!! Contribute to the Great Scratch Prime Number Search: https://scratch.mit.edu/projects/109056960/ Click thy flag! Use turbo mode (shift + click green flag) for actual speed. Note that the percent bar is only a rough approximation. It usually takes a tiny bit longer to calculate near the end of the calculation. On my computer, using turbo mode, it takes less than a second to calculate 10000. It whizzes through 100000 in a bit over 10 seconds. It took about three minutes to calculate all 78498 primes under one million.
This prime number calculator uses the standard method, but with a huge difference. This uses an optimization system, so it only will check factors when it needs to. It will only check numbers that aren't multiples of 2, 3, 5, 7, and 11. It will stop the calculation when it realizes the number isn't a prime or when no more numbers are big enough to be factors. It also only checks factors that are prime.
