29

This number is a prime.

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29 = (2*7) + (3*5), i.e., the first n primes placed in product pairs whereas the first factors are increasing and the second factors are decreasing, then added together. Can you find the next prime with this property? [Bergot]

Submitted: 2018-04-05 13:11:23;   Last Modified: 2018-04-05 14:14:10.
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