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Digital Prime (Posted on 2014-05-04) Difficulty: 3 of 5
The digital root of a prime number having the form m3-n3 is 1 or 7, where each of m and n is a positive integer, with m > n.

Is this assertion always valid?

If so, prove it.
If not, provide a counterexample.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
SolutionPossible solutionbroll2014-05-04 22:50:11
No SubjectBenny2014-05-04 19:35:00
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