Please Help!
phi(N) = euler's function = x
how we can find N, when we are given x. let's name it like phi_inv(x) = N
for example:
phi_inv(4) = 5, because phi(5) = 4.
x ≤ 1010
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Please Help!
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write n in form of p_i ^ e_i, and we should have p_1 < p_2 < ... and e_1 >= e_2 >= ..., then factor n and use depth first search to get the answer?
i am not just sure i have solved the problem...