Highly divisible triangular number

The sequence of triangle numbers is generated by adding the natural numbers. So the 7'th 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