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Truth or consequences (Posted on 2017-11-02) Difficulty: 4 of 5
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    
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No Subject Comment 2 of 2 |
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
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