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Factorial Primes are prime numbers that can be expressed in the form n!±1, ie they are prime numbers that are one bigger or smaller than a factorial number. A factorial number is a number that is made by multiplying consecutive numbers, starting with 1, eg 4!=1*2*3*4. Both 11 and 13 are factorial primes because they complete the rule 4!±1.

The First Few Factorial PrimesEdit

2

3

5

7

11

13

23

719

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