1927

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The brilliant number 1927 = 41 * 47 = 2^11 - 11^2. Note also that 1927 is an emirpimes because its reversal 7291 = 23 * 317 is also semiprime. [Post]

Submitted: 2004-10-14 05:26:32; Last Modified: 2023-09-24 13:34:19.