Write a function to find numbers divisible by two numbers.
Define a function that takes 3 parameters(all positive integers) in this order: num1, num2, end_num
Function should return a list of all numbers less than end_num that are divisible by both num1 and num2.
Example:
Input:
2, 3, 13
Output:
[6, 12]
Challenge: Write the function without using for-loop.