21 × 1 = 21
21 × 2 = 42
21 × 3 = 63
21 × 4 = 84
21 × 5 = 110
21 × 6 = 126
21 × 7 = 147
21 × 8 = 168
21 × 9 = 189
21 × 10 = 210
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