Search Problems   RSS Feed
projecteuler.net

Euler's Totient Function Equals 13!

 Published on Saturday, 6th June 2009, 01:00 am; Solved by 1390;
Difficulty rating: 70%

Problem 248

The first number $n$ for which $\phi(n)=13!$ is $6227180929$.

Find the $150\,000$th such number.