Question 1012721
I'm looking at this, but I am not entirely clear what you mean...if the common differences are 1,2,3,...,n and the first term is one, the series looks like this to me:
1+2+4+7+11+16+22+29+37+46+...
Here n=10, so their sum should equal 10(10^2+1)/2 = 505, but it doesn't...even if n=9, the sum should be 369, and it isn't...
I am intrigued by the problem...please clarify...