 
Robert Franek wrote a book entitled The Best 331 Colleges.
Sound travels just over 331 meters per second in dry (0% humidity) air at zero degrees Celsius. [Necula]
The total population of Rives,
Tennessee (the address of one of the authors), as of the 2000 census.
133 331
1333 3331
13333 33331
133333 333331
1333333 3333331
13333333 33333331
composite and prime
The total number of reduced quadratic forms having one class per genus. [Noe]
The United States conducted 331 atmospheric nuclear bomb tests before the test ban treaty of 1962. [McCranie]
331 = 11*13*17-2^2*3*5^2*7, using only the potential prime divisors (with multiplicity) up to the square root; and they use all of them. Can you find an expression for the next prime (337) in such a way? [Wood]
331 is the smallest prime that is good, happy, lucky, and cuban. [Green]
(There is one curio for this number that has not yet been approved by an editor.)
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