Comparing four-sided and six-sided dice
Find the sum of all the natural numbers that are multiples of 3 or 5 using the inclusion-exclusion principal.
Find the sum of all the even-valued terms in the Fibonacci sequence which do not exceed 4 million.
Find the largest palindrome made from the product of two 3-digit numbers.
Find the smallest number divisible by each of the numbers 1 to 20.
Find the difference between the sum of the squares and the square of the sum.
Find the 10001st prime.
Discover the largest product of thirteen consecutive digits in the 1000-digit number.
Calculate the sum of all the primes below two million.
Find the greatest product of four adjacent numbers in the same direction in a grid.