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  2. Unary numeral system - Wikipedia

    en.wikipedia.org/wiki/Unary_numeral_system

    The unary numeral system is the simplest numeral system to represent natural numbers: [1] to represent a number N, a symbol representing 1 is repeated N times. [2]In the unary system, the number 0 (zero) is represented by the empty string, that is, the absence of a symbol.

  3. Names of small numbers - Wikipedia

    en.wikipedia.org/wiki/Names_of_small_numbers

    Download as PDF; Printable version; ... You can help by providing page numbers for existing citations. ... 1×10 −9: One One-Billionth: One One-Milliardth: nano-n:

  4. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Using all numbers and all letters except I and O; the smallest base where ⁠ 1 / 2 ⁠ terminates and all of ⁠ 1 / 2 ⁠ to ⁠ 1 / 18 ⁠ have periods of 4 or shorter. 35 Covers the ten decimal digits and all letters of the English alphabet, apart from not distinguishing 0 from O.

  5. The Penguin Dictionary of Curious and Interesting Numbers

    en.wikipedia.org/wiki/The_Penguin_Dictionary_of...

    The Penguin Dictionary of Curious and Interesting Numbers is a reference book for recreational mathematics and elementary number theory written by David Wells. The first edition was published in paperback by Penguin Books in 1986 in the UK, and a revised edition appeared in 1997 ( ISBN 0-14-026149-4 ).

  6. Attic numerals - Wikipedia

    en.wikipedia.org/wiki/Attic_numerals

    In general, the number to be represented was broken down into simple multiples (1 to 9) of powers of ten — units, tens, hundred, thousands, etc.. Then these parts would be written down in sequence, from largest to smallest value. For example: 49 = 40 + 9 = ΔΔΔΔ + ΠΙΙΙΙ = ΔΔΔΔΠΙΙΙΙ; 2001 = 2000 + 1 = ΧΧ + I = ΧΧΙ

  7. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    In base 10, ten different digits 0, ..., 9 are used and the position of a digit is used to signify the power of ten that the digit is to be multiplied with, as in 304 = 3×100 + 0×10 + 4×1 or more precisely 3×10 2 + 0×10 1 + 4×10 0. Zero, which is not needed in the other systems, is of crucial importance here, in order to be able to "skip ...