23

This number is a prime.

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Kristen Eller ©2002
+ October 23 is Mole Day. It is celebrated among chemists in North America from 6:02 A.M. to 6:02 P.M. on 10/23 each year in honor of Avogadro's number, which is approximately 6.02 * 10^23. [Pritesh]

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