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Mathematicians have tried in vain to this day to discover some order in the sequence of prime numbers, and we have reason to believe that it is a mystery into which the human mind will never penetrate.
In G. Simmons Calculus Gems, New York: McGraw Hill Inc., 1992.
Leonard Euler's Solution to the Konigsberg Bridge Problem
Biggs, Norman L., E. K. Lloyd, and Robin J. Wilson. Graph Theory: 1736-1936. Oxford: Clarendon Press, 1976.
Dunham, William. Euler: The Master of Us All. Washington: The Mathematical Association of America, 1999.
"History of Mathematics: On Leonhard Euler (1707-1783)." ScienceWeek (2003). 6 Nov. 2005 <http://scienceweek.com/2003/sc031121-6.htm>.
Hopkins, Brian, and Robin Wilson. "The Truth about Königsberg." College Mathematics Journal (2004), 35, 198-207.
"Konigsberg Bridges." Konigsberg. The MacTutor History of Mathematics Archive. <http://www-history.mcs.st- and.ac.uk/history/Miscellaneous/other_links/Konigsberg.html>.