2717
This number is a composite.
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The only 2-sphenic number (2717 = 11 x 13 x 19) concatenated from two double-digit numbers (c;n) showing that c is the nth composite number, i.e., 27 is the 17th composite number. [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
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