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The day of the week is one of Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday. The day of the week
for a given year, month, and day can be found using
DayOfWeek[{y, m, d}] in the Mathematica
add-on package Miscellaneous`Calendar` (which can be loaded with the command <<Miscellaneous`).
 Friday the Thirteenth
Kraitchik, M. "The Calendar." Ch. 5 in
Mathematical Recreations. New York: W. W. Norton, pp. 109-116, 1942.
Uspensky, J. V. and Heaslet, M. A. Elementary Number Theory. New York: McGraw-Hill, pp. 206-211, 1939.
Vardi, I. Computational Recreations in Mathematica. Reading, MA: Addison-Wesley, pp. 237-238, 1991.
© 1996-2007 Eric W. Weisstein
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