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  2. 72 (number) - Wikipedia

    en.wikipedia.org/wiki/72_(number)

    [6] 72 has an Euler totient of 24. [7] It is a highly totient number, as there are 17 solutions to the equation φ(x) = 72, more than any integer under 72. [8] It is equal to the sum of its preceding smaller highly totient numbers 24 and 48, and contains the first six highly totient numbers 1, 2, 4, 8, 12 and 24 as a subset of its proper divisors.

  3. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    13 things in the gigameter group Upper part: Gamma Orionis, Algol B, the Sun (centre), and other objects to scale. The gigametre (SI symbol: Gm) is a unit of length in the metric system equal to 1 000 000 000 meters (10 9 m). To help compare different distances this section lists lengths starting at 10 9 meters (1 gigameter (Gm) or 1 billion ...

  4. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Imaginary numbers: Numbers that equal the product of a real number and the imaginary unit , where =. The number 0 is both real and imaginary. Complex numbers (): Includes real numbers, imaginary numbers, and sums and differences of real and imaginary numbers.

  5. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    Ratio of a circle's circumference to its radius. Equal to : 1900 to 1600 BCE [2] Square root of 2, Pythagoras constant [4] 1.41421 35623 73095 04880 [Mw 2] [OEIS 3] Positive root of = 1800 to 1600 BCE [5] Square root of 3, Theodorus' constant [6]

  6. Shem HaMephorash - Wikipedia

    en.wikipedia.org/wiki/Shem_HaMephorash

    The number 24 of the thrones multiplied by the 3 rays of the crown which equals 72, the name of God of 72 letters, which is thus mystically shown in the name YHVH, as under: (Or as the book of Revelation says: "When the living creatures (the four Kerubim the Letters of the Name) give glory to Him, etc. the four and twenty elders fall down ...

  7. List of organisms by chromosome count - Wikipedia

    en.wikipedia.org/wiki/List_of_organisms_by...

    The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, protists, and other living organisms.This number, along with the visual appearance of the chromosome, is known as the karyotype, [1] [2] [3] and can be found by looking at the chromosomes through a microscope.

  8. Ages of Three Children puzzle - Wikipedia

    en.wikipedia.org/wiki/Ages_of_Three_Children_puzzle

    The Ages of Three Children puzzle (sometimes referred to as the Census-Taker Problem [1]) is a logical puzzle in number theory which on first inspection seems to have insufficient information to solve.

  9. 72 equal temperament - Wikipedia

    en.wikipedia.org/wiki/72_equal_temperament

    Although the 72 equal temperament is based on irrational intervals (see above), as is the 12 tone equal temperament (12 EDO) mostly commonly used in Western music (and which is contained as a subset within 72 equal temperament), 72 equal temperament, as a much finer division of the octave, is an excellent tuning for both representing the ...