User:WillNess
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I am a newbie, interested in Haskell.
I like this:
primes = 2 : 3 : ([5,7..] `minus`
foldi (\x:xs -> (x:) . union xs)
[[p*p,p*p+2*p..] | p <- tail primes])
foldi is on Tree-like folds. More at Prime numbers.