2004

This number is a composite.

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

2004*2^20238 + 1 is a 6096-digit prime. Note that 2004*4002 - 1 is prime also. [Firoozbakht]

2004 is the smallest multi-digit number m such that phi(π(m))^(1/2) - π(phi(m))^(1/2) = 1. Note the next year with this property is 2088. [Firoozbakht]