6

This number is a composite.

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

F₀*F₁*F₂*...*F₆*(F₆ - 1) - 1 is prime, where F_n denotes the nth Fermat number. [Wesolowski]

(1# + 2# + 3# + 4# + 5# + 6#) is one-half of (1! + 2! + 3! + 4! + 5! + 6!). [Wesolowski]

(6!) = 2! + 3! + 5!. [Wesolowski]