Problems I've solved from www.projecteuler.net
Problems:
- Find the sum of all the multiples of 3 or 5 below 1000.
- By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
- What is the largest prime factor of the number 600851475143 ?
- Find the largest palindrome made from the product of two 3-digit numbers.
- What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?
- Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
- What is the 10 001st prime number?
- Find the greatest product of five consecutive digits in the 1000-digit number. ( See euler8.py for the number )
- There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product abc.
- Find the sum of all the primes below two million.
- What is the greatest product of four adjacent numbers in the same direction (up, down, left, right, or diagonally) in the 20×20 grid?