# 8951

This number is a prime.

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The prime 8951 is the number of ways to choose 20
arithmetic operators (call them c1, c2, ..., c20) each
either a * or / sign, so that 1 c1 2 c2 3 c3, ..., c20 21
is an integer. This is the largest known prime of that
form. Curiously, it is also a prime that is a sum of twin
primes and their indices, and a primitive prime divisor of
(3^32-1)/2. [Post]
Submitted: 2008-07-25 13:46:37; Last Modified: 2008-07-27 18:28:17.

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