A device for computing Euler’s totient operate, determines the depend of constructive integers lower than or equal to a given integer which are comparatively prime (coprime) to it. For instance, the totient of 10 is 4, as 1, 3, 7, and 9 are coprime to 10. This operate is usually denoted utilizing the Greek letter phi ().
This operate performs an important function in quantity concept and cryptography. It options prominently in RSA encryption, a cornerstone of recent on-line safety. Leonhard Euler’s introduction of the operate within the 18th century laid groundwork for a lot of subsequent mathematical developments. Understanding its properties permits for optimized calculations in fields like modular arithmetic.