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  2. 27 (number) - Wikipedia

    en.wikipedia.org/wiki/27_(number)

    Twenty-seven is the cube of 3, or the 2nd tetration of 3: 2 3 = 3 3 = 3 × 3 × 3. It is divisible by the number of prime numbers below it . The first non-trivial decagonal number is 27. [1] 27 has an aliquot sum of 13 [2] (the sixth prime number) in the aliquot sequence (27, 13, 1, 0) of only one composite number, rooted in the 13-aliquot tree ...

  3. English numerals - Wikipedia

    en.wikipedia.org/wiki/English_numerals

    twenty-three point three eight billion Often, large numbers are written with (preferably non-breaking ) half-spaces or thin spaces separating the thousands (and, sometimes, with normal spaces or apostrophes ) instead of commas —to ensure that confusion is not caused in countries where a decimal comma is used.

  4. Numeral prefix - Wikipedia

    en.wikipedia.org/wiki/Numeral_prefix

    Words in the cardinal catgegory are cardinal numbers, such as the English one, two, three, which name the count of items in a sequence. The multiple category are adverbial numbers, like the English once , twice , thrice , that specify the number of events or instances of otherwise identical or similar items.

  5. 28 (number) - Wikipedia

    en.wikipedia.org/wiki/28_(number)

    [3] Twenty-eight is a harmonic divisor number, [4] a happy number, [5] the 7th triangular number, [6] a hexagonal number, [7] a Leyland number of the second kind [8] (), and a centered nonagonal number. [9] It appears in the Padovan sequence, preceded by the terms 12, 16, 21 (it is the sum of the first two of these). [10]

  6. Number Pieces - Wikipedia

    en.wikipedia.org/wiki/Number_Pieces

    This piece may be performed with Twenty-Eight (Fifty-Four), Twenty-Nine (Fifty-Five), or both (Eighty-Three). All time brackets contain a single sound. The first violin starts the videoclock. Twenty-Eight: 3 flutes, 1 alto flute, 4 clarinets, 3 oboes, 1 English horn, 3 bassoons, 1 contrabassoon, 4 trumpets, 4 horns, 2 trombones, 1 bass trombone ...

  7. Latin numerals - Wikipedia

    en.wikipedia.org/wiki/Latin_Numerals

    The adjective alter, altera, alterum meaning 'other [of two]' was more frequently used in many instances where English would use 'second'. Ordinal numbers, not cardinal numbers, are commonly used to represent dates, because they are in the format of 'in the tenth year of Caesar', etc. which also carried over into the anno Domini system and ...

  8. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    10 −3 s: One thousandth of a second. Shortest time unit used on stopwatches. jiffy (electronics) ~ 10 −3 s: Used to measure the time between alternating power cycles. Also a casual term for a short period of time. centisecond: 10 −2 s: One hundredth of a second. decisecond: 10 −1 s: One tenth of a second. second: 1 s: SI base unit for ...

  9. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    3. The equality of the volumes of two tetrahedra of equal bases and equal altitudes. 4. Problem of the straight line as the shortest distance between two points. 5. Lie's concept of a continuous group of transformations without the assumption of the differentiability of the functions defining the group. 6. Mathematical treatment of the axioms ...