One of the Popular contest in Hackerrank based on a famous site ProjectEuler.net is 

Project Euler+ 

Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.

So its a lonng contest with pretty big number of questions to be solved.

Coming forth i will be posting the Algorithms and Solutions on Python which i have used to solve the problems.
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