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2 x 3 x 5 x 7 x 11 x 13 x 17 + 1 = 510511 = 19 x 97 x 277

bob12356 wrote:2 x 3 x 5 x 7 x 11 x 13 x 17 + 1 = 510511 = 19 x 97 x 277

Well, this is embarrassing...

73 is the best number...

I came for the jokes and was confused by the maths...

A J Irving wrote:

bob12356 wrote:2 x 3 x 5 x 7 x 11 x 13 x 17 + 1 = 510511 = 19 x 97 x 277

Well, this is embarrassing...

Yup.

...

Ah! This sheds some light.

http://primes.utm.edu/notes/proofs/infi ... clids.html

So you don't necessarily generate a new prime, you may instead generate a number (P) that is divisible by a prime that wasn't in the list of primes used to generate P.