primes = lambda n: filter(lambda x, m=set(): not (x in m or m.update(range(x,n,x))), range(2,n)) >>> primes(13) [2, 3, 5, 7, 11]
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primes = lambda n: filter(lambda x, m=set(): not (x in m or m.update(range(x,n,x))), range(2,n)) >>> primes(13) [2, 3, 5, 7, 11]