Korselt's Criterion - MATLAB Cody - MATLAB Central

Problem 56308. Korselt's Criterion

  • Created by HH
Difficulty:
(28)
Rate
A composite integer n (n>=2) divides b^n-b, i.e. mod(b^n-b,n)==0, for all integers b if and only if n is square-free (doesn't have repeating prime factors) and n-1 is divisible by p-1, i.e. mod(n-1,p-1)==0, for all prime divisors p of n.
Given a positive integer x, return c, the number of integers n satisfying Korselt's Criterion, where 1 < n < 10^x.
Example:
x = 2;
c = 0
Example:
x = 3;
c = 1
Solve

Solution Stats

87.5% Correct | 12.5% Incorrect
Last Solution submitted on Jun 05, 2023

Problem Comments

Solution Comments

Show comments
Who Deserves Your Praise? Discover the New Contribution Widget!
...
We are excited to announce another update to our Discussions area: the...

Problem Recent Solvers6

Suggested Problems

More from this Author45

Community Treasure Hunt

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

Start Hunting!
Go to top of page