repeating subtraction in 129
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129 -1=128
128 -3=125
125-5=120
120-7=113
113-11=102
102-13=89
89-15=74
74-17=57
57-19=38
38-21=17
17-23=-6
therefore 129 is not a square number
128 -3=125
125-5=120
120-7=113
113-11=102
102-13=89
89-15=74
74-17=57
57-19=38
38-21=17
17-23=-6
therefore 129 is not a square number
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