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12 first abundandt number (1 + 2 + 3 + 4 + 6 = 16 > 12)

Kissing number in three dimension is 12

125 = 45 + 55 + 65 + 75 + 95 + 115

212 - 1 = 3 * 3 * 5 * 7 * 13

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11 - 12 - 13

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