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132 (number)

From Wikipedia, the free encyclopedia
Natural number
← 131132 133 →
Cardinalone hundred thirty-two
Ordinal132nd
(one hundred thirty-second)
Factorization22 × 3 × 11
Divisors1, 2, 3, 4, 6, 11, 12, 22, 33, 44, 66, 132
Greek numeralΡΛΒ´
Roman numeralCXXXII,cxxxii
Binary100001002
Ternary112203
Senary3406
Octal2048
DuodecimalB012
Hexadecimal8416

132 (one hundred [and] thirty-two) is thenatural number following131 and preceding133. It is 11dozens.

In mathematics

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132 is the sixthCatalan number.[1] With twelve divisors total where 12 is one of them, 132 is the 20threfactorable number, preceding thetriangular136.[2]

132 is anoblong number, as the product of 11 and 12[3] whose sum instead yields the 9thprime number23;[4] on the other hand, 132 is the99thcomposite number.[5]

Adding all two-digitpermutation subsets of 132 yields the same number:

12+13+21+23+31+32=132{\displaystyle 12+13+21+23+31+32=132}.

132 is the smallest number indecimal with this property,[6] which is shared by264, 396 and 35964 (seedigit-reassembly number).[7]

The number ofirreducible trees with fifteenvertices is 132.[8]

In a15×15{\displaystyle 15\times 15}toroidal board in then–Queens problem, 132 is thecount of non-attacking queens,[9] with respectiveindicator of19[10] andmultiplicity of1444 =382[11] (where, 2 × 19 = 38).[12]

The exceptionalouter automorphism ofsymmetric groupS6 uniquely maps vertices to factorizations andedges to partitions in thegraph factors of thecomplete graph with six vertices (and fifteen edges)K6, which yields 132blocks inSteiner systemS(5,6,12).

In other fields

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References

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  1. ^"Sloane's A000108 : Catalan numbers".The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2016-05-27.
  2. ^Sloane, N. J. A. (ed.)."Sequence A033950 (Refactorable numbers: number of divisors of k divides k. Also known as tau numbers.)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2024-03-12.
  3. ^Sloane, N. J. A. (ed.)."Sequence A002378 (Oblong (or promic, pronic, or heteromecic) numbers: a(n) equal to n*(n+1).)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2024-03-12.
  4. ^Sloane, N. J. A. (ed.)."Sequence A000040 (The prime numbers.)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2024-03-12.
  5. ^Sloane, N. J. A. (ed.)."Sequence A002808 (The composite numbers.)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2024-03-12.
  6. ^Wells, D.The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 138
  7. ^Sloane, N. J. A. (ed.)."Sequence A241754 (Numbersn equal to the sum of all numbers created from permutations ofd digits sampled fromn)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  8. ^Sloane, N. J. A. (ed.)."Sequence A000014 (Number of series-reduced trees with n nodes.)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2023-09-02.
  9. ^Sloane, N. J. A. (ed.)."Sequence A054502 (Counting sequence for classification of nonattacking queens on n X n toroidal board.)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2024-02-10.
  10. ^Sloane, N. J. A. (ed.)."Sequence A054500 (Indicator sequence for classification of nonattacking queens on n X n toroidal board.)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2024-02-10.
  11. ^Sloane, N. J. A. (ed.)."Sequence A054501 (Multiplicity sequence for classification of nonattacking queens on n X n toroidal board.)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2024-02-10.
  12. ^I. Rivin, I. Vardi and P. Zimmermann (1994).The n-queens problem.American Mathematical Monthly. Washington, D.C.:Mathematical Association of America.101 (7): 629–639.doi:10.1080/00029890.1994.11997004JSTOR 2974691
0 to 199
200 to 399
400 to 999
1000s and 10,000s
1000s
10,000s
100,000s to 10,000,000,000,000s
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