(Difference between revisions)
Revision as of 18:06, 3 August 2011
I am a newbie, interested in Haskell.
I like this:
primes = 2 : g (fix g) -- double staged production idea due to M. O'Neill fix g = xs where xs = g xs g xs = 3 : (gaps 5 $ foldi (\x:xs -> (x:) . union xs) [[p*p, p*p+2*p..] | p <- xs]) gaps k s@(x:xs) -- | k<=x = minus [k,k+2..] xs -- inlined to avoid a space leak = if k < x then k : gaps (k+2) s else gaps (k+2) xs