Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:
1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …
By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
Using infinite Fibonacci sequence:
A bit shorter version can be derived using
> val eulerProblem2Answer : int = 4613732 val eulerProblem2Answer' : int = 4613732 val eulerProblem2Answer'' : int = 4613732