Choose how many numbers you want to sieve first. (For a faster load/sieve, put a . right after the number, sieves multiples of 2 at the start) Then press space to do a 1-by-1 sieving or a to set it on auto. Composite numbers will become crossed with x. In the end, all the numbers in the list will be prime numbers. Press green flag again to choose again.
The Sieve of Eratosthenes finds prime numbers by cancelling out the multiples of the primes. In this project the initial loading part and the first few primes will take some time, please be patient! (It's how fast Scratch can go) During processing if the project runs for too long it will slow, clicking See inside will help refresh the speed.
