Answer
1380 is not perfect because:
1 + 2 + 3 + 4 + 5 + 6 + 10 + 12 + 15 + 20 + 23 + 30 + 46 + 60 + 69 + 92 + 115 + 138 + 230 + 276 + 345 + 460 + 690 ≠ 1380
Related links:
- All calculations
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