欧拉计划问题十二matlab实现

Problem 12 ：

The sequence of triangle numbers is generated by adding the natural numbers. So the 7th triangle number would be                   1 + 2 + 3 + 4 + 5 + 6 + 7 = 28. The first ten terms would be:

                                    1, 3, 6, 10, 15, 21, 28, 36, 45, 55, ...

Let us list the factors of the first seven triangle numbers:

1: 1
           3: 1,3
           6: 1,2,3,6
         10: 1,2,5,10
         15: 1,3,5,15
         21: 1,3,7,21
         28: 1,2,4,7,14,28

We can see that 28 is the first triangle number to have over five divisors.

What is the value of the first triangle number to