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This question already has an answer here:

I am having trouble with equation of type:

φ(n) = a, where a is positive integer and n is an integer

I need to find n, since I need to find all numbers n I was thinking about some modular arithmetic relation but didn't come with anything suitable for problem. What is valid mathematical approach for this problem and how all n can be found? Thanks!

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marked as duplicate by Dietrich Burde, Matthew Conroy, carmichael561, C. Falcon, Jaideep Khare Apr 29 '17 at 23:00

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ I am sorry, didnt find the question while searching! Thanks $\endgroup$ – TijuanaTaxi Apr 29 '17 at 11:48