Multiples of 3 or 5

# Misc-Python-Problems

import time
time.process_time()

def multiplesof3or5(n):
	multiplesarray = []
	for i in range(n):
		if i % 3 == 0:
			multiplesarray.append(i)
		elif i % 5 == 0:
			multiplesarray.append(i)
	return multiplesarray

print(sum(multiplesof3or5(10)))
print(sum(multiplesof3or5(100)))
print(sum(multiplesof3or5(1000)))

#Above: my solution

#Below: Project Euler's Solution
print(sum(multiplesof3or5(1000000)))
#print(sum(multiplesof3or5(10000000)))

def SumDivBy(n, to):
	m = (to-1)//n
	return (n*m*(m+1))//2

print(SumDivBy(3, 10) + SumDivBy(5, 10) - SumDivBy(15, 10))
print(SumDivBy(3, 1000) + SumDivBy(5, 1000) - SumDivBy(15, 1000))
print(SumDivBy(3, 1000000) + SumDivBy(5, 1000000) - SumDivBy(15, 1000000))
print(SumDivBy(3, 1000000000) + SumDivBy(5, 1000000000) - SumDivBy(15, 1000000000))

print("\n", time.process_time(), "seconds")