November 2022 - Problem of the Month

7⁴ means 7x7x7x7 which is equal to 2401 so when 7⁴ is expressed as an integer, the last digit is a 1. 

What is the last digit of 7¹¹ when it is expressed as an integer?

Solution

The last digit is a 3.  What is the last digit of 7²⁰⁰ when it is expressed as an integer?