These are squares
12^2
11^2
10^2
9^2
8^2
7^2=49
6^2=36
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144 = 12 x 12 121 = 11 x 11 100 = 10 x 10 81 = 9 x 9 64 = 8 x 8 49 = 7 x 7
Notice the pattern: 12^2 11^2 10^2 9^2 .. So the next term is 6^2=36
The square numbers closest to 99 and 149 are 100 (10^2) and 144 (12^2), respectively. The square number between 100 and 144 is 121 (11^2), as it falls between the square roots of 100 and 144. Thus, the square number between 99 and 149 is 121.
The first five square numbers greater than 100 are 121, 144, 169, 196, and 225.
36...49....64...81...100...121...144 They are the square numbers.