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Homework Statement
Let PosZ = {z ∈ Z : z > 0}. Consider the function f : PosZ → PosZ dened as follows:
• f(1) = 1
• If z ∈ PosZ and z > 1 then f(z) is the largest integer that divides z but is distinct from z. (For
example f(41) = 1 and f(36) = 18.)
Prove that f is surjective.
Homework Equations
none
The Attempt at a Solution
I want to try and show that for every n > 1, n= f(z) for some z. So note that for all n > 1, n = f(2n). But don't know if that makes sense or how to do that. And in the case of f(41) = 1, it's not true...