Problem 15: Starting in the top left corner in a 20 by 20 grid, how many routes are there to the bottom right corner?

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Problem 15: Starting in the top left corner in a 20 by 20 grid, how many routes are there to the bottom right corner?
Problem 14: Find the longest sequence using a starting number under one million. (via Collatz conjecture)
Problem 13: Find the first ten digits of the sum of onehundred 50digit numbers.
Problem 12: What is the value of the first triangle number to have over five hundred divisors?
Problem 11: What is the greatest product of four adjacent numbers on the same straight line in the 20 by 20 grid?
Problem 10: Calculate the sum of all the primes below two million.
Problem 9: Find the only Pythagorean triplet, {a, b, c}, for which a + b + c = 1000.
Problem 8: Discover the largest product of five consecutive digits in the 1000digit number.
Problem 6:
What is the difference between the sum of the squares and the square of the sums?