2222

This number is a composite.

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

2222 = 2¹ + 2² + 2³ + 2⁵ + 2⁷ + 2¹¹. Note that the number of 2s in the equation equals the larger of the prime exponents, which form a prime sequence, with the exception of '1.' [Gevisier]