Do one of the following programming problems:
Summation
      Create a function called summation_less_than(max_sum).  
      This function should
      return the largest number of sequential integers that sum to less
      than the specified positive integer max_sum.  Put
      another way, return the largest \(n\) such that:
    
$$(\sum_{i=0}^n i) < max\_sum$$
Is Prime
  Create a function called is_prime(number) that
  returns True if the parameter number is a
  prime number and False otherwise.  Assume
  that number is an integer greater than 1.  Recall that
  number is prime if it is not divisble by any numbers other than 1
  and itself.
The function should not use a for loop. Instead, it should use a while loop that stops as soon as a divisor is found. The function should also only have one return statement that is the last statement in the function and not inside the loop.