31

This number is a prime.

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The big "31" sign made its debut at all Baskin-Robbins stores in 1953, offering customers a different ice cream for every day of the month. Note that 31 is the largest prime factor of 1953. [Coneglan]

Submitted: 2001-12-20 22:56:02; Last Modified: 2008-01-30 17:19:14.