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• BuzzsawAnn

  

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  December 18, 2005
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  Jan 7, 2006, 11:28 am

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  987 is the only 3-digit number with consecutively decreasing digits such that when multiplied by the sum of its digits plus and minus one, the results are primes. I.e., 987*(9+8+7)-1 and 987*(9+8+7)+1 are primes.