Euler's Totient function, φ(n) [sometimes called the phi function], is used to determine the number of numbers less than n which are relatively prime to n. For example, as 1, 2, 4, 5, 7, and 8, are all less than nine and relatively prime to nine, φ(9)=6.
|n|Relatively Prime|φ(n)|n/φ(n)|
|--- |--- |--- |--- |
|2|1|1|2|
|3|1,2|2|1.5|
|4|1,3|2|2|
|5|1,2,3,4|4|1.25|
|6|1,5|2|3|
|7|1,2,3,4,5,6|6|1.1666...|
|8|1,3,5,7|4|2|
|9|1,2,4,5,7,8|6|1.5|
|10|1,3,7,9|4|2.5|
It can be seen that n=6 produces a maximum n/φ(n) for n ≤ 10.
Find the value of n ≤ 1,000,000 for which n/φ(n) is a maximum.
## Instructions