EULER TOTIENT FUNCTION

general
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Can anyone explain why and where we use Euler Totient Function. Please provide a pseudo-code or a code to compute it.

Thanks in advance. :slight_smile:

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In number theory, Euler’s totient function (or Euler’s phi function), denoted as φ(n) or ϕ(n), is an arithmetic function that counts the positive integers less than or equal to n that are relatively prime to n. (These integers are sometimes referred to as totatives of n.)

For a detailed tutorial about it check this link.

I hope this helps.

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Thanks for the help.
Can you suggest some problem statements for practice.

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problem on ETF

on other plateform

https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=1120

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Thanks for the help.