## Project Euler #011 - Largest product in a grid

What is the greatest product of four adjacent numbers in the same direction (up, down, left, right, or diagonally) in the 20×20 grid?

## Project Euler #010 - Summation of primes

The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.
Find the sum of all the primes below two million.

## Problem

A Pythagorean triplet is a set of three natural numbers, $$a < b < c$$, for which,
$$\qquad a^2 + b^2 = c^2$$
For example, $$3^2 + 4^2 = 25 = 5^2$$
There exists exactly one Pythagorean triplet for which $$a + b + c = 1000$$.
Find the product $$abc$$.

PE#009 ...

## Project Euler #008 - Largest product in a series

Find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?

## Project Euler #007 - 10001st prime

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 10001st prime number?