The difference between two consecutive triangular numbers is 15. Find the numbers?

Well, the n-th triangular number is the sum of the first n numbers. So obviously 2 such numbers are.

Thought I had the right answer till I saw your proof!

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.