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A prime

**number**, often shortened to just prime, is an integer greater than 1 that is not the product of two smaller positive integers. The first few prime numbers are ...The first ordinal

**number**that is not a natural**number**is expressed as ω; this is also the ordinal**number**of the set of natural numbers itself. The least ordinal of cardinality ℵ 0 (that is, the initial ordinal of ℵ 0) is ω but many well-ordered sets with cardinal**number**ℵ 0 have an ordinal**number**greater than ω.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. Octal: Base 8, occasionally used by computer system designers and programmers.

The symbol # is known variously in English-speaking regions as the

**number**sign, [1] hash, [2] or pound sign. [3] The symbol has historically been used for a wide range of purposes including the designation of an ordinal**number**and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔ .A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

t. e.

**Number**theory (or arithmetic or higher arithmetic in older usage) is a branch of pure mathematics devoted primarily to the study of the integers and arithmetic functions. German mathematician Carl Friedrich Gauss (1777–1855) said, "Mathematics is the queen of the sciences—and**number**theory is the queen of mathematics." [1]You can find instant answers on our

**AOL Mail**help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.Kasner used it to illustrate the difference between an unimaginably large

**number**and infinity, and in this role it is sometimes used in teaching mathematics. To put in perspective the size of a googol, the mass of an electron, just under 10 −30 kg , can be compared to the mass of the visible universe, estimated at between 10 50 and 10 60 kg ...