Approved.This suggested edit was approved and applied to the post about 2 years ago by Peter Taylor.
Find all integer solution for the equation below: $$a_1(a_1+k)(a_1+2k)...(a_1+(2k+1)d)+1 = x^2$$ To write it in iterated operator notation: $$ 1+\prod_{k=0}^{2k+1} (a_1 + kd) = x^2 $$
Suggested about 2 years ago by celtschk
