1373
This number is a prime.
Just showing those entries submitted by 'Loungrides': (Click here to show all)
The smallest prime formed by concatenating two double-digit
emirps (13, 73). Note that 3137, formed from their
reversals, is also prime. [Loungrides]
The smallest prime formed by inserting an emirp between the
digits of another emirp. [Loungrides]
(There are 2 curios for this number that have not yet been approved by an editor.)
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