perplexus.info :: Just Math : Truth or consequences

Truth or consequences (Posted on 2017-11-02)

Is it true that 2ⁿ-2 is not divisible by n when n is composite?

Prove or show a counterexample.

No Solution Yet Submitted by Ady TZIDON

No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)

No Subject

| Comment 2 of 3 |

Such numbers are known as Fermat pseudoprimes. They continue 5461, 6601, 7957, 8321, 8481, 8911, 10261.

Posted by xdog on 2017-11-02 18:12:58

Please log in:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (7)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info