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27 (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 2-digit number in which the sum of digits is equal to the sum of prime factors (27 = 3 x 3 x 3 and 3 + 3 + 3 = 9). [Russo] Vaughan (1977) showed that all integers are the sum of at most 27 prime numbers. 2 and 7 are the smallest and largest single-digit primes. 2 + 3 + 4 + 5 + 6 + 7 = 27. [Stone] The product of the first 27 Mersenne prime exponents (minus one) is a 27 reversed-digit prime. Smaller of the smallest pair of consecutive numbers with 3 prime factors. [Gupta] The smallest number that is both a Smith number and a SPRP for a base less than one hundred. [H. Brown] The smallest composite number n > 1 such that n! + 1 is prime. [Capelle]
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