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xWhiteyx
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Generally, I am stumped by the Phi function. I have found out the pattern but I am having difficulty proving it.
i) When p is a prime number, obtain an expression in terms of p for:-
ϕ(p²)
ϕ(p)=p-1
ϕ(p)=p-1
so ϕ(5)=4 therefore p²=5²=25 therefore ϕ(p²)=20
Also, if p=3 then ϕ(3)=2 therefore ϕ(9)=6
It appears that ϕ(p²)= p(p-1)
My problem is that I am not able to proof it. Yes, the pattern is p(p-1) but I am stuck as to how to explain it. Any soloutions?
Homework Statement
i) When p is a prime number, obtain an expression in terms of p for:-
ϕ(p²)
Homework Equations
ϕ(p)=p-1
The Attempt at a Solution
ϕ(p)=p-1
so ϕ(5)=4 therefore p²=5²=25 therefore ϕ(p²)=20
Also, if p=3 then ϕ(3)=2 therefore ϕ(9)=6
It appears that ϕ(p²)= p(p-1)
My problem is that I am not able to proof it. Yes, the pattern is p(p-1) but I am stuck as to how to explain it. Any soloutions?