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  2. 3 - Wikipedia

    en.wikipedia.org/wiki/3

    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 ...

  3. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

  4. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  5. Category:3 (number) - Wikipedia

    en.wikipedia.org/wiki/Category:3_(number)

    This page was last edited on 1 December 2024, at 08:31 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  6. 1,227 QI Facts to Blow Your Socks Off - Wikipedia

    en.wikipedia.org/wiki/1,227_QI_Facts_To_Blow...

    1,227 QI Facts To Blow Your Socks Off is the sixth in a series of books based on the intellectual British panel game QI, written by series-creator John Lloyd, director of research John Mitchinson, and chief researcher James Harkin.

  7. 39 (number) - Wikipedia

    en.wikipedia.org/wiki/39_(number)

    It is a perfect totient number. [3] 39 is the sum of five consecutive primes (3 + 5 + 7 + 11 + 13) and also is the product of the first and the last of those consecutive primes. Among small semiprimes only three other integers (10, 155, and 371) share this attribute. 39 also is the sum of the first three powers of 3 (3 1 + 3 2 + 3 3).

  8. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  9. 12 (number) - Wikipedia

    en.wikipedia.org/wiki/12_(number)

    Twelve is the largest number with a single-syllable name in English.Early Germanic numbers have been theorized to have been non-decimal: evidence includes the unusual phrasing of eleven and twelve, the former use of "hundred" to refer to groups of 120, and the presence of glosses such as "tentywise" or "ten-count" in medieval texts showing that writers could not presume their readers would ...

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