148

This number is a composite.

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Placing each digit d (from 148) into the function 2d + 1 always produces a prime. Note that the sum of the three primes (3, 17 & 257) is prime also. [Russo]

Submitted: 2001-06-01 14:32:17;   Last Modified: 2008-01-30 11:28:00.
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