0
Anonymous
they are all squares - 1², 2², 5², 6², 7², 9²
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.... 49, 36, 25, 16, 9, 4 and 1
25 36 49 64 81 100 121 144
81
16, 25, 36, 49, 64, or 81
36, 49, 64 and 81