17947

This number is a composite.

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The smallest brilliant number, 17947 = 131 * 137, whose the reversal is a 2-sphenic number, with all its prime factors being double-digit emirps, i.e., 74971 = 13 * 73 * 79. [Loungrides]

Submitted: 2010-07-13 14:07:17; Last Modified: 2018-12-25 14:12:24.