90, 99, 108, 117, 126, 135, 144, 153, 162, 171, 180, 189, 198, 207, 216, 225, 234, 243, 252, . . .
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9 x 9 = 81 9 squared = 81 3 squared times 3 squared = 81
-1 × 81 -3 × 27 -9 × 9 -27 × 3 -81 × 1
Exactly 423 times
72 times.
81