1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400
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square numbers 1 to 1000
92
202 would be 20 x 20 in expanded form.
you find it by adding up the numbers of cm " in a square
the awnswer is 1,4,16,and...