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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 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] 2141 and 2273 are the first pair of consecutive Sophie Germain primes that are both Honaker primes. [Gaydos] The smallest Honaker prime for which the sums of the squares of the digits of itself and its prime index (323) are also equal. [Gaydos]
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