Eighty-three
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Eighty-three (83, LXXXIII) is the natural number following eighty-two and preceeding eighty-four. It is the sum of three consecutive primes (23 + 29 + 31) as well as the sum of five consecutive primes (11 + 13 + 17 + 19 + 23).

• Hexadecimal: 53
• Binary: 01010011
• Factors: 1, 83
• the 23rd prime number, following seventy-nine and preceeding eighty-nine. Also a Sophie Germain prime
• Ordinal number: eighty-third

83 is also:

• the atomic number of bismuth (Bi)
• the hours in 83 Hours 'Til Dawn
• the model number of Bell XP-83
• the Messier number of M83, the Southern Pinwheel Galaxy
• the number of the French department Var
• the designation of Interstate 83, a freeway that runs from Maryland to Pennsylvania; European route E83 from Bjala to Sofia
• the year AD 83 or AD 1983.

The original article can be found at: http://en.wikipedia.org/wiki/Eighty-three.
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