A number traditionally associated with bad luck. A so-called baker's dozen is equal to 13. Fear of the number
13 is called triskaidekaphobia. There are 13 Archimedean solids. Mazur and Tate (1973/74)
proved that there is no elliptic curve over the rationals 
having a rational point of order 13.
Baker's Dozen, Triskaidekaphobia
Mazur, B. and Tate, J. "Points of Order 13 on Elliptic Curves." Invent. Math. 22, 41-49, 1973/74.
Wells, D. The Penguin Dictionary of Curious and Interesting Numbers. Middlesex, England: Penguin Books, 1986.
Eric W. Weisstein. "13."
From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/13.html
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