BibSonomy

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Project Euler

http://projecteuler.net/index.php?section=problems

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100+
challenge
contest
euler
game
logic
math
puzzles

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Developer: Overview; API Documentation

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BibSonomy is offered by the Data Science Chair of the University of Würzburg, the Information Processing and Analytics Group of the Humboldt-Unversität zu Berlin, the KDE Group of the University of Kassel, and the L3S Research Center.