- 216 (number)
**216**is thenatural number following 215 and preceding 217.Since $216\; =\; 3^3\; +\; 4^3\; +\; 5^3\; =\; 6^3$, it is the smallest cube that's also the sum of three cubes (

Plato was among the first to notice this, and mentioned it in Book VIII of "Republic"). It is also the sum of atwin prime (107 + 109). But since there is no way to express it as the sum of theproper divisor s of any other integer, it is anuntouchable number .This multiplicative

magic square $egin\{pmatrix\}2\; 9\; 12\backslash 36\; 6\; 1\backslash 3\; 4\; 18end\{pmatrix\}$

has magic constant 216.

In base 10, it is a

Harshad number .**In other fields*** The number of digits in the sequence (Naturalis Veritas, the end of the history, Massimo Nardotto, 2007): 1 1 2 3 5 8 4 3 7 1 8 9 8 8 7 6 4 1 5 6 2 8 1 9 2 2 4 6 1 7 8 6 5 2 7 9 7 7 5 3 8 2 1 3 4 7 2 9 3 3 6 9 6 6 3 9 3 3 6 9 6 6 3 9 3 3 6 9 6 6 3 9 4 4 8 3 2 5 7 3 1 4 5 9 5 5 1 6 7 4 2 6 8 5 4 9 5 5 1 6 7 4 2 6 8 5 4 9 4 4 8 3 2 5 7 3 1 4 5 9 6 6 3 9 3 3 6 9 6 6 3 9 3 3 6 9 6 6 3 9 3 3 6 9 7 7 5 3 8 2 1 3 4 7 2 9 2 2 4 6 1 7 8 6 5 2 7 9 8 8 7 6 4 1 5 6 2 8 1 9 1 1 2 3 5 8 4 3 7 1 8 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9

* The 216 colors formed by a 6×6×6 color cube are sometimes known as the web-safe color palette.

*ISO 216 is the ISO's standard forpaper size s.

* In the film "Pi", Max becomes obsessed with a 216-digit number in his quest to find the numeric equation behind existence, and is told by a group ofHasidic Jews that it represents the true name of God.

* As six cubed, 216 is also symbolic of theMark of the Beast inChristianity . This has been expressed in the "Left Behind " series. This is interesting as the quotient of 144,000/666 is 216.216216216... These two numbers are used extensively throughout the book of Revelation in the Holy Bible, where the Mark of the Beast is identified.

*The 216th verse of theApocalypse : (Revelation 13:4) " And they worshipped thedragon which gave power unto thebeast "'

* A song by the band British based band Meet Me at Midnight**ee also***The year

216 **References*** Wells, D. (1987). "The Penguin Dictionary of Curious and Interesting Numbers" (p. 144). London: Penguin Group.

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