73

This number is a prime.

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Pi Day (March 14 or 3/14) occurs on the 73rd day of the year on non-leap years. Howard Aiken died on Pi Day at the age of 73. He was the primary engineer behind IBM's Harvard Mark I computer. [Rupinski]

Submitted: 2003-03-08 03:40:04; Last Modified: 2009-03-30 23:18:58.