Hello, What's the difference between "Int" and "Integer"? How can I tell Haskell which one I want? I'm having trouble with a function: ints = 0 : map (1+) ints prng = map iter ints where iter 0 = [0,0] iter n = [i,j] where i = mod n 256 j = ints !! i (eventually 'iter' will be more a more interesting function). When I try to load this module in Hugs I get the error: ERROR "./PRNG.hs":24 - Type error in list *** Expression : [i,j] *** Term : j *** Type : Integer *** Does not match : Int Line 24 is the 'prng' line. I've spent all day trying to fix this, but for the life of me I can't figure out why it happens or how to make it stop. Haskell just doesn't seem to like the 'iter !! i' construct. It's interesting that if you replace 'i' by (say) 3, Haskell runs the program happily. But, if you replace 'i = mod n 256' by 'i=3' you get the same error. Any words of wisdom would be appreciated. Cheers, Daniel.