Code

Problem 11: Largest Product In A Grid

Problem 14: Longest Collatz Sequence

Problem 3: Largest Prime Factor

Problem 74: Digit Factorial Chains

Problem 89: Roman Numerals

Problem 37: Truncatable Primes

Problem 1: Multiples of 3 or 5

Problem 63: Powerful Digit Counts

Problem 32: Pandigital Products

Problem 10: Summation of Primes

Problem 26: Reciprocal Cycles

Problem 48: Self Powers

Problem 99: Largest Exponential

Problem 13: Large Sum

Problem 2: Even Fibonacci Numbers