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821 (another Prime Pages' Curiosity) |
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will be down at times on those day (and possibly the next). (caldwell@utm.edu) The smallest prime of the first prime quadruple for which the sums of the cubes of the digits of the four primes (821, 823, 827, 829) are primes themselves (521, 547, 863, 1249). [Trotter] The smallest prime whose reversal is a seventh power (128 = 27). [Gupta] 6! + 5! - 4! + 3! - 2! + 1!. [Lownsdale]
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