148

This number is a composite.

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

Submitted: 2001-06-01 19:32:17; Last Modified: 2022-10-03 15:52:01.