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Even Fibonacci numbers

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.

Code:


val fibonachi = {
val list = scala.collection.mutable.MutableList(1,2)
var i:Int = 2
do {
val tmp = list(i-2) + list(i-1)
list += tmp
i+=1
}while (list(i-1) < 4000000) list.init }.filter(_ % 2 ==0).sum println(fibonachi)

Answer : 4613732

Find the sum of all the multiples of 3 or 5 below 1000.

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

Find the sum of all the multiples of 3 or 5 below 1000.

Code :


val list = for (a <- 1 to 999 if (a % 5 == 0 || a % 3 == 0) ) yield a println(list.sum)

Answer should be: 233168