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Hexadecimal (also known as base-16 or simply hex) is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 and "A"–"F" to represent values from ten to fifteen.
Every hexagonal number is a triangular number, but only every other triangular number (the 1st, 3rd, 5th, 7th, etc.) is a hexagonal number. Like a triangular number, the digital root in base 10 of a hexagonal number can only be 1, 3, 6, or 9. The digital root pattern, repeating every nine terms, is "1 6 6 1 9 3 1 3 9".
Natural numbers including 0 are also sometimes called whole numbers. [1] [2] ... Hexadecimal: Base 16, widely used by computer system designers and programmers, ...
A form of unary notation called Church encoding is used to represent numbers within lambda calculus. Some email spam filters tag messages with a number of asterisks in an e-mail header such as X-Spam-Bar or X-SPAM-LEVEL. The larger the number, the more likely the email is considered spam. 10: Bijective base-10: To avoid zero: 26: Bijective base-26
binary, ternary, octal, decimal, hexadecimal (numbers expressed in base 2, base 3, base 8, base 10, base 16) septuagenarian, octogenarian (a person 70–79 years old, 80–89 years old) centipede , millipede (subgroups of arthropods with around 100 feet, or around 1 000 feet)
Computer engineers often need to write out binary quantities, but in practice writing out a binary number such as 1001001101010001 is tedious and prone to errors. Therefore, binary quantities are written in a base-8, or "octal", or, much more commonly, a base-16, "hexadecimal" (hex), number format. In the decimal system, there are 10 digits, 0 ...
Hex key, a tool also known as a hex wrench or Allen wrench, used to drive fasteners; Hex key, a number sign (#) key on telephones (regional term used in Singapore and Malaysia) High-energy X-rays, sometimes abbreviated "HEX-rays" Hexcentric, an item of climbing protection equipment; Heat exchanger, a device for heat transfer
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