43

This number is a prime.

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In the days before the proliferation of area codes in the 1990's, there were two adjacent area codes that were multiples of 43: Pennsylvania's 215 (5 * 43) and Maryland's 301 (7 * 43). [Litman]

Submitted: 2001-12-02 03:35:55; Last Modified: 2010-01-16 14:33:50.