45

This number is a composite.

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(45, 54) is the only pair of double-digit composite numbers (ab, ba) such that ab * ba + 1 is a 2-sphenic number, i.e., 45 * 54 + 1 = 2431 = 11 x 13 x 17. [Loungrides]

Submitted: 2020-04-01 04:50:35; Last Modified: 2020-07-13 15:51:26.