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In a humorous old puzzle, "Professor Euclide Paracelso Bombast Umbugio of Guayazuela" predicts the end of the world for the year 2141 A.D. [Trigg] The smallest multidigit prime such that sum of its digits equals the product of digits. [Russo] The smallest prime that differs from its reversal by both a square and cube. [Poo Sung]
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