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2000 2000
big cheese
16 -9
4 & 9
2130
25 + 49 = 74
89 = 25 + 64 = 5² + 8²
1
81 + 16
They are 25+49 = 74
They are: 49+64 = 113
121 - 16 = 105. There are two other pairs.