They are
1*1, 2*2, 3*3 and so on, until 20*20.
Use a calculator to work out the values.
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the first 4 square numbers are 1, 4, 9, and 16.
the first 20, arre... 3.1459265358979323846
The numbers are (10- square root of 101) and (10+square root of 101)
1,4,9,25,36,49,64,81,100,121,144,169,196,225
1,4,9,16,25,36.