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Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages.Numbers are written with combinations of letters from the Latin alphabet, each with a fixed integer value.
The Latin numerals are the words used to denote numbers within the Latin language. They are essentially based on their Proto-Indo-European ancestors, and the Latin cardinal numbers are largely sustained in the Romance languages.
210 is an abundant number, [1] and Harshad number. It is the product of the first four prime numbers (2, 3, 5, and 7), and thus a primorial, [2] where it is the least common multiple of these four prime numbers. 210 is the first primorial number greater than 2 which is not adjacent to 2 primes (211 is prime, but 209 is not).
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).
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311 (three hundred [and] eleven) is the natural number following 310 and preceding 312.. 311 is the 64th prime; a twin prime with 313; an irregular prime; [1] an emirp, an Eisenstein prime with no imaginary part and real part of the form ; a Gaussian prime with no imaginary part and real part of the form ; and a permutable prime with 113 and 131.
Leonhard Euler noted 65 idoneal numbers (the most known, of only a maximum possible of two more), such that + for an integer , expressible in only one way, yields a prime power or twice a prime power.
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.