# 5

This number is a prime.

Just showing those entries submitted by 'Silva': (Click here to show all)

The only prime sum of two consecutive Sophie Germain primes. [Silva]

5 is the only prime in the middle of a pair of cousin primes. [Silva]

The only prime which is immediately preceded and followed by a semiprime. [Silva]

The arithmetic average of the first sixteen digits of the decimal expansion of π. [Silva]

The first number to appear between composites. [Silva]

The smallest number n such that neither n!+1 nor n!-1 is prime. [Silva]

The only prime equal to a prime p plus the pth prime. [Silva]

The only prime p that is the sum of the prime divisors of p+1. [Silva]

The only Fibonacci prime that is the sum of two others. [Silva]

The smallest arithmetic average of consecutive primes. [Silva]