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				@sljux I really mean "I copied from Haskell wiki," but i think it was Eratosthenes sieve.
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devios156308yI don't think using only 10% of CPU is a good thing. It just means it could have run 10 times faster. 
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whatevel12So, today I was at my college library, working on an Haskell project that I have for my Functional Programming... 

Made a program to list primes until stopped. I got to about 2 billion when it took 8 GB of RAM and I more or less had to stopped it.
Only took 10% of CPU though.
rant
out of ram
primes
haskell