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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