Perfect Squares:

Some people (including me) consider the perfect squares
(square numbers) to be good numbers. Perfect squares are obtained by squaring integers:

0^2=0, (-1)^2=1^2=1, (-2)^2=2^2=4, (-3)^2=3^2=9, (-4)^2=4^2=16,
(-5)^2=5^2=25,...

The perfect squares up to 100 are:

0,1,4,9,16,25,36,49,64,81,100.