Answer
312 is not perfect because:
1 + 2 + 3 + 4 + 6 + 8 + 12 + 13 + 24 + 26 + 39 + 52 + 78 + 104 + 156 ≠ 312
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Answer
312 is not perfect because:
1 + 2 + 3 + 4 + 6 + 8 + 12 + 13 + 24 + 26 + 39 + 52 + 78 + 104 + 156 ≠ 312