Solutions for Project Euler's problems. Written in 
Ruby, driven by tests using 
RSpec.
- Multiples of 3 or 5
- Even Fibonacci Numbers
- Largest Prime Factor
- Largest Palindrome Product
- Smallest Multiple
- Sum Square Difference
- 10001st Prime
- Largest Product in a Series
- Special Pythagorean Triplet
- Summation of Primes
- Largest Product in a Grid
- Highly Divisible Triangular Number
- Large Sum
- Longest Collatz Sequence
- Lattice Paths
- Power Digit Sum
- Number Letter Counts
- Maximum Path Sum I & II
- Counting Sundays
- Factorial Digit Sum