If a positive integer can be expressed as the square difference of two positive integers, it is called wisdom number. What is the wisdom number

If a positive integer can be expressed as the square difference of two positive integers, it is called wisdom number. What is the wisdom number

two thousand six hundred and seventy-nine
b^2-a^2=(b+a)(b-a)
All odd numbers from 3
Starting from 8, the multiples of 4 are