Find Prime numbers using list
#First build a list of non-prime numbers, using a single list comprehension,
#then use another list comprehension to get the "inverse" of the list,
#which are prime numbers.
noprimes = [j for i in range(2, 8) for j in range(i*2, 50, i)]
primes = [x for x in range(2, 50) if x not in noprimes]
print primes
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