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The Romans used a duodecimal rather than a decimal system for fractions, as the divisibility of twelve (12 = 2 2 × 3) makes it easier to handle the common fractions of 1 ⁄ 3 and 1 ⁄ 4 than does a system based on ten (10 = 2 × 5).
211 is an odd number.; 211 is a primorial prime, the sum of three consecutive primes (+ +), a Chen prime, a centered decagonal prime, and a self prime. [1]211 is the smallest prime separated by 12 from the nearest primes (199 and 223).
666 is also the sum of the squares of the first seven primes (2 2 + 3 2 + 5 2 + 7 2 + 11 2 + 13 2 + 17 2), [7] [10] while the number of twin primes less than 6 6 + 666 is 666. [11] A prime reciprocal magic square based on in decimal has a magic constant of 666.
The masculine nominative/accusative forms dŭŏ < Old Latin dŭō ‘two’ is a cognate to Old Welsh dou ‘two’, [16] Greek δύω dýō ‘two’, Sanskrit दुवा duvā ‘two’, Old Church Slavonic dŭva ‘two’, that imply Proto-Indo-European *duu̯o-h 1, a Lindeman variant of monosyllabic *du̯o-h 1, living on in Sanskrit ...
12 (twelve) is the natural number following 11 and preceding 13. Twelve is the 3rd superior highly composite number , [ 1 ] the 3rd colossally abundant number , [ 2 ] the 5th highly composite number , and is divisible by the numbers from 1 to 4 , and 6 , a large number of divisors comparatively.
231 is the 21st triangular number, [1] a doubly triangular number, a hexagonal number, an octahedral number [2] and a centered octahedral number. [3] 231 is palindromic in base 2 (11100111 2). 231 is the number of integer partitions of 16. The Mertens function of 231 returns 0. [4]
Visual proof that 3 3 + 4 3 + 5 3 = 6 3. 216 is the cube of 6, and the sum of three cubes: = = + +. It is the smallest cube that can be represented as a sum of three positive cubes, [1] making it the first nontrivial example for Euler's sum of powers conjecture.
111 is the fourth non-trivial nonagonal number, [1] and the seventh perfect totient number. [ 2 ] 111 is furthermore the ninth number such that its Euler totient φ ( n ) {\displaystyle \varphi (n)} of 72 is equal to the totient value of its sum-of-divisors :