162849681287

This number is a prime.

16 2849681287

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The smallest prime formed by inserting between the digits of a double-digit number n, the concatenation in order of all the perfect numbers that are smaller than 10000, i.e., (6, 28, 496, 8128). [Loungrides]

Submitted: 2018-11-06 16:24:27; Last Modified: 2019-09-13 13:42:44.