73

This number is a prime.

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There are 73 composite numbers under 10^2. Proof: 73+25 primes = 98. There are 99 numbers under 10^2, but 1 is neither prime nor composite. This is the only instance of a prime count of composites through 10^22. [Haga]

Submitted: 2004-03-09 09:16:00; Last Modified: 2008-01-30 17:28:00.