Task

The objective is to write a function that finds the sum of all positive multiples of 3 or 5 below n.

Show output for n = 1000.

This is is the same as Project Euler problem 1.

Extra credit: do this efficiently for n = 1e20 or higher.




sum-divisible n:
	0
	for i range 1 -- n:
		if or = 0 % i 3 = 0 % i 5:
			+ i
 
!. sum-divisible 1000