6/Historical Note

Historical Note on 6|$6$
The number 6|$6$ was believed by the Pythagoreans to be perfect, as it was the sum of:
 * $1$, the unity
 * $2$, the principle of diversity
 * $3$, the "sacred trinity".

The fact that $1 + 2 + 3 = 1 \times 2 \times 3$ added to its mystique.