[Haskell-cafe] Looking for the fastest Haskell primes algorithm
Eugene Kirpichov
ekirpichov at gmail.com
Tue Apr 14 08:57:29 EDT 2009
I'd suggest also
primesFrom :: Integer -> [Integer]
and probably a separate function
nextPrime :: Integer -> Integer
2009/4/14 Andrew Wagner <wagner.andrew at gmail.com>:
> Some other ideas for things to put in this package possibly:
> is_prime :: Int -> Bool
> nth_prime :: Int -> Int -- or Int -> Integer
> prime_factors :: Int -> [Int]
>
> I'm assuming there are faster ways of doing the first 2 than by just simply
> looking through all of primes. Someone should also look through Euler - I'm
> sure that will generate other ideas of things that could be useful in
> playing with primes.
> On Tue, Apr 14, 2009 at 8:40 AM, Niemeijer, R.A. <r.a.niemeijer at tue.nl>
> wrote:
>>
>> Today I happened to need a large list of prime numbers. Obviously this is
>> a well-known problem, so I figured there would be something on Hackage that
>> I could use. Surprisingly, there isn’t, or if there is it’s not easy to
>> find. Searching for prime or primes on Hackage reveals nothing. Searching
>> for primes on Hayoo gives Codec.Encryption.RSA.NumberTheory, but that uses
>> the inefficient one-liner implementation. The HaskellWiki article on primes
>> (http://www.haskell.org/haskellwiki/Prime_numbers) has a number of
>> implementations, but the faster they get, the longer and uglier they become.
>>
>>
>>
>> Since it’s such a common problem I’d say it would be a good idea to add a
>> package to Hackage that exports
>>
>> primes :: [Integer]
>>
>> and hides the ugly implementation details. Data.Numbers.Primes seems a
>> logical choice for the namespace, but I’m open to suggestions.
>>
>>
>>
>> The trick then is to find the most efficient implementation of primes. The
>> Haskell wiki article mentions ONeillPrimes.hs as one of the fastest ones,
>> but maybe there’s a faster version. So my question is: does anybody know
>> what the fastest Haskell algorithm for generating primes is?
>>
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>
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--
Eugene Kirpichov
Web IR developer, market.yandex.ru
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