Answer
1260 is not perfect because:
1 + 2 + 3 + 4 + 5 + 6 + 7 + 9 + 10 + 12 + 14 + 15 + 18 + 20 + 21 + 28 + 30 + 35 + 36 + 42 + 45 + 60 + 63 + 70 + 84 + 90 + 105 + 126 + 140 + 180 + 210 + 252 + 315 + 420 + 630 ≠ 1260
Related links:
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