Earned on 26 Feb 2013 for solving Problem 1. Times 2 - START HERE.
Earned on 2 May 2013 for liking Solution 238918.
Earned on 15 Apr 2013 for commenting on Solution 190565.
Earned on 30 Apr 2013 for creating Problem 1471. Index of a Rational number.
Earned on 8 May 2015 for first solving Problem 1467. Key Generation for Solitaire Cipher.
Solve all the problems in CUP Challenge problem group.
Solve a problem with a best solution.
Earned on 21 Nov 2016 at 17:22 for having 50 or more solvers for Problem 1472. nth Rational Number.
Solve all the problems in Tiles Challenge problem group.
Earned on 29 Apr 2013 for solving all the problems in ASEE Challenge.
Solve all the problems in Cody Challenge problem group.
Earned on 1 May 2013 for creating 10 problems.
Solve 500 problems.
Solve all the problems in Modeling and Simulation Challenge problem group.
Solve all the problems in Magic Numbers problem group.
Must receive 25 total likes for the problems you created.
Must receive 50 total likes for the solutions you submitted.
Solve all the problems in Indexing I problem group.
Must receive 10 likes for a solution you submitted.
Must receive 10 likes for a problem you created.
Solve all the problems in Indexing II problem group.
Choose your country to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a location from the following list:
See all countries