-39
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You multiply each number by itself: The square of 1 is 1x1, the square of 2 is 2x2, the square of 3 is 3x3, etc.
4, 9, 16, 25, and 36 are the square numbers between 1 and 40.
1, 4, 9, 16, 25, 36
The square numbers between 1 and 20 are 1,4,9 and 16.
1,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39 are the composite numbers between 1 and 40.
All whole numbers between 1 and 400 (=20 square).