Challenges for Mathematics and Programming enthusiasts.

Question

Click on the link below, register and get started with ProjectEuler.
https://projecteuler.net/register

<Description: Directly from Wikipedia>
Project Euler (named after Leonhard Euler) is a website dedicated to a series of computational problems intended to be solved with computer programs. It includes over 600 problems, with a new one added once every two weeks (except during the summer break).
Try it out. It's fun.

Answer 1

  Problems are of varying difficulty but each is solvable in less than a minute of CPU time using an efficient algorithm on a modestly powered computer. Problems can be sorted on difficulty.

Answer 2

In following list there are other links to programming challenges sites:

https://code.sololearn.com/WaVusr8J1KvK/?ref=app