Prime Curios!: 191

191
(another Prime Pages' Curiosity)

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Multiply the even composites 4*6*8 - 1 and get 191 using 3 terms and 2 multiplications. Do the same + 1 and get 193 -- the first set of twin primes using this process. [Haga]

Submitted: 2004-03-25 00:38:15; Last Modified: 2008-01-30 11:28:00.