Version note: Ruby 2.3, Python 3.5.x
- Euler 1: Find the sum of all the multiples of 3 or 5 below 1000. Answer: 233168
- Euler 2: Do not exceed four million, find the sum of the even-valued terms of fib 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ... Answer: 4613732
- Euler 3: Find the largest prime factor of the number 600851475143. Answer: 6857
- Euler 4: Find the largest palindrome (number read double ways) made from the product of two 3-digit numbers. Answer: 906609
- Euler 5: Find the smallest multiple that is evenly divisable for 1 to 20? Answer: 232792560
- Euler 6: the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum. Answer: 25164150
- Euler 7: Find the 10,001st prime. Answer: 104743
- Euler 8: Find the thirteen adjacent digits in the 1000-digit number that have the greatest product. Answer: 23514624000