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84 (another Prime Pages' Curiosity) |
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Its digits are composite. Yet each digit minus 1, the sum of the digit minus 1 and the absolute value of the difference of the digits minus 1 is prime. [Russo] The product of its digits minus 1 is prime. [Wolfe] 84 is the smallest number that can be expressed as the sum of 3 distinct primes raised to distinct prime exponents (25 + 33 + 52). [Russ] 84!2 + prime(48) is prime. [Firoozbakht]
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