Question 965727
The series is 1,2,3,................
Sum=8515
Sum=n(n+1)/2 where n is the number of terms
n(n+1)/2=8515
n(n+1)=17030
n^2+n-17030=0
*[invoke quadratic "x", 1, 1, -17030 ]
The number of terms is 130.