Project Euler (projecteuler.net) - Is there someone registered?

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I found these site some weeks ago, it is about solving problems using programming and mathemathical skills. In the home page we can read: "What 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. (...)" You can find what's left of the answer and answers to other questions in the home page of projecteuler.net. There are problems dated from 2001 and there's an announcement that a new problem (the 177) will be post soon. If you didn't know of this site and like mathematics and this kind of problems I suggest you to register yourself in the site. I already did 21 problems now they are getting harder and to write an efficient code to solve one problem is taking more time but it's jus great when after writting a code for like 20minutes ou run it and get the answer in less than a second. If you have already registered yourself in projecteuler.net please tell your rating and which problem you are trying to solve, we also can share our different methods of solving a specific problem or try to fix some deficient codes. I'm crrently working on problem 17, my code still needs some improvements. I've already solved the problems: 1,2,3,4,5,6,7,8,9,10,12,13,14,15,16,20,25,28,48 and 53.