Merge pull request TheAlgorithms#191 from sachinarora707/master

Project Euler Problems Added.

Project Euler/README.md

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+# ProjectEuler
+
+Problems are taken from https://projecteuler.net/.
+
+Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical 
+insights to solve. Project Euler is ideal for mathematicians who are learning to code. 
+
+Here the efficiency of your code is also checked.
+I've tried to provide all the best possible solutions.
+
+PROBLEMS:
+
+1. If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3,5,6 and 9. The sum of these multiples is 23.
+   Find the sum of all the multiples of 3 or 5 below N.
+
+2. Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2,
+   the first 10 terms will be:
+      1,2,3,5,8,13,21,34,55,89,..
+   By considering the terms in the Fibonacci sequence whose values do not exceed n, find the sum of the even-valued terms.  
+   e.g. for n=10, we have {2,8}, sum is 10.
+
+3. The prime factors of 13195 are 5,7,13 and 29. What is the largest prime factor of a given number N?
+   e.g. for 10, largest prime factor = 5. For 17, largest prime factor = 17.
+
+4. A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99.
+   Find the largest palindrome made from the product of two 3-digit numbers which is less than N.
+
+5. 2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. 
+   What is the smallest positive number that is evenly divisible(divisible with no remainder) by all of the numbers from 1 to N?
+
+6. The sum of the squares of the first ten natural numbers is,
+      1^2 + 2^2 + ... + 10^2 = 385
+   The square of the sum of the first ten natural numbers is,
+     (1 + 2 + ... + 10)^2 = 552 = 3025
+   Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 − 385 = 2640.
+   Find the difference between the sum of the squares of the first N natural numbers and the square of the sum. 
+
+7. By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.
+   What is the Nth prime number?