89

This number is a prime.

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The only double-digit prime that can be written as p*q+r in seven ways, where p, q, r are distinct primes, i.e., 89 = 2*3+83 = 2*5+79 = 2*11+67 = 2*23+43 = 2*29+31 = 2*41+7 = 2*43+3. [Loungrides]

Submitted: 2012-12-03 19:10:18; Last Modified: 2018-05-04 10:52:55.