3221
This number is a prime.
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The smallest prime (emirp) formed by concatenating the sum and the product of digits of a number n, with the number n, (case n=21). Shall we call 3221 an SPn prime? [Loungrides]
Submitted: 2010-11-07 08:38:11; Last Modified: 2018-10-17 13:56:11.
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