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purely functional implementation of prime numbers generator
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| def from(n: Integer): Stream[Integer] = n #:: from(n+1) | |
| def sieve(input: Stream[Integer]): Stream[Integer] = input.head #:: sieve(input.tail.filter(_ % input.head != 0)) | |
| def primes = sieve(from(2)) | |
| primes take 10 print |
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