-- Exercice from slide 42/82 dividers n = [k | k <- [2..(n-1)], rem n k == 0] dividersf n = filter (\k -> rem n k == 0) [2..(n-1)] primer n = [i | i <- [2..(n-1)], null (dividers i)] primerf n = filter (\i -> null (dividersf i)) [2..(n-1)]