Question 176
We say that a set $E$ of natural numbers is special when taking any two different elements $a, b \in E$ has that $(a-b)^2$ divides the product $ab$.
a. finds a special set made up of three elements.
b. Is there a special set formed by four natural numbers that are in arithmetic progression?
a. finds a special set made up of three elements.
b. Is there a special set formed by four natural numbers that are in arithmetic progression?