Interesting factoid #1: (provided on 03/29/2005 11:17:04 PM EST by murdoog)

47 is an interesting number in it's on right. You can generate a sequence of primes by starting with 2, then multiplying each number by 2 and adding 1. 47 is the last prime in this sequence before you produce a composite number

Here's the sequence:

2,5,11,23,47

The next number is 95, which is a composite. (The proof of which is left as an exercise).

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