MathDB
2019 Fall Team #7

Source:

April 17, 2022
number theory

Problem Statement

Let SS be the set of all positive integers nn satisfying the following two conditions: ∙\bullet nn is relatively prime to all positive integers less than or equal to n6\frac{n}{6} ∙\bullet 2n≡42^n \equiv 4 mod nn What is the sum of all numbers in SS?
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