179

This number is a prime.

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The sum of all the double-digit primes, each consisting of successive digits in ascending order, is an emirp, i.e., 23 + 67 + 89 = 179. Note that the concatenation of these three primes in descending order, i.e., 896723 is a prime. [Loungrides]

Submitted: 2012-04-24 17:55:31; Last Modified: 2020-07-28 13:57:42.