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I know from my friends who major in CS that there are many reputable online CS constests.

Can you give me examples of reputable online math contests ?

It would be better if they are for undergraduates.

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math.stackexchange.com –  Mud Apr 24 '13 at 18:43
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Just by hanging around here I have learned about Brilliant.org. I should let @CalvinLin advertise that site properly in his (coming?) answer, as he is involved with them. –  Jyrki Lahtonen Apr 24 '13 at 18:48
    
Al Zimmermann's Programming Contests –  Ed Pegg Apr 24 '13 at 20:23

1 Answer 1

http://www.brilliant.org has weekly problem sets at five different levels in Algebra, Number Theory, and Combinatorics

http://www.internetolympiad.org has monthly contests with prizes, in addition to seasonal team proof-based contests (One called the Winter NIMO, and the others part of the Online Math Open)

http://www.proofathon.org/ is a monthly competition where each competition is themed on a different topic (the ongoing contest is themed "Graph Theory and Game Theory")

MathFights: http://www.mathfights.com is a real-time math game at levels ranging from easy MATHCOUNTS problems to high AMC12-level problems.

For The Win: http://www.artofproblemsolving.com/Edutainment/ftwcs3/index.php is a real-time math game meant to simulate the MATHCOUNTS Countdown Round

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Some more there? –  Sagnik Saha Jun 28 at 8:02

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