Problem 3079. Big numbers, repeated least significant digits

This problem builds off of Problem 3077
Given an integer x which contains d digits, find the value of (minimum) n (n > 1) such that the last d digits of x^n is equal to x. If the last d digits will never equal x, return inf.
Example 1:
  • x = 2; (therefore d = 1)
  • 2^2 = 4, 2^3 = 8, 2^4 = 16, 2^5 = 32
  • n = 5;
Example 2:
  • x = 10; (therefore d = 2)
  • 10^2 = 100, 10^3 = 1000, etc
  • n = inf;

Solution Stats

25.59% Correct | 74.41% Incorrect
Last Solution submitted on May 17, 2024

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers67

Suggested Problems

More from this Author4

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!