2..2^2 - 2..1^2

2^2 - 1^2 = 3

22^2 - 21^2 = 43

222^2 - 221^2 = 443

2222^2 - 2221^2 = 4443

22222^2 - 22221^2 = 44443

222222^2 - 222221^2 = 444443

2222222^2 - 2222221^2 = 4444443