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53 is a sexy prime with 47 and 59. It is the eighth Sophie Germain prime, and the ninth Eisenstein prime. [1] The sum of the first 53 primes is 5830, which is divisible by 53, a property shared by only a few other numbers. [2][3] 53 cannot be expressed as the sum of any integer and its decimal digits, making 53 the ninth self number in decimal.
A number is a mathematical object used to count, measure, and label]]. The most basic examples are the natural numbers 1, 3, 3, 4, and so forth. [1] Numbers can be represented in language with number words]. More universally, individual numbers can be represented by symbols, called numerals; for example, "5" is a numeral that represents the ...
A natural number is divisible by three if the sum of its digits in base 10 is divisible by 3. For example, the number 21 is divisible by three (3 times 7) and the sum of its digits is 2 + 1 = 3. Because of this, the reverse of any number that is divisible by three (or indeed, any permutation of its digits) is also divisible by three. For ...
Ternary: The base-three numeral system with 0, 1, and 2 as digits. Quaternary: The base-four numeral system with 0, 1, 2, and 3 as digits. Hexadecimal: Base 16, widely used by computer system designers and programmers, as it provides a more human-friendly representation of binary-coded values.
Divisibility by 5 is easily determined by checking the last digit in the number (475), and seeing if it is either 0 or 5. If the last number is either 0 or 5, the entire number is divisible by 5. [2] [3] If the last digit in the number is 0, then the result will be the remaining digits multiplied by 2.
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn . Many writers begin the sequence with 0 and 1, although some authors start it from 1 and 1 [1][2] and some (as did Fibonacci) from 1 ...
Natural numbers are also used as labels, like jersey numbers on a sports team, where they serve as nominal numbers and do not have mathematical properties. [2] [5] The natural numbers form a set, commonly symbolized as a bold N or blackboard bold . Many other number sets are built from the natural numbers.