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Project Euler 243 Solution

Find fractions that cannot be cancelled down (resilient fraction).

Project Euler 69 Solution

Find the value of n ≤ 1,000,000 for which n/φ(n) is a maximum.

Project Euler 70 Solution

Investigate values of n for which φ(n) is a permutation of n.

Project Euler 182 Solution

RSA encryption