2004

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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]

Submitted: 2004-09-10 09:08:46; Last Modified: 2008-01-30 17:28:00.