From Wikipedia, the free encyclopedia
238 (two hundred [and] thirty-eight) is the
natural number following
237 and preceding
239.
In mathematics
Natural number
238 is an
untouchable number.
[1]
There are 238
2-vertex-connected graphs on five labeled vertices,
[2] and 238 order-5 polydiamonds (
polyiamonds that can partitioned into 5 diamonds).
[3] Out of the 720 permutations of six elements, exactly 238 of them have a unique
longest increasing subsequence.
[4]
There are 238
compact and paracompact
hyperbolic groups of
ranks 3 through 10.
[5]
References
-
^
Sloane, N. J. A. (ed.).
"Sequence A005114 (Untouchable numbers: impossible values for sum of aliquot parts of n)". The
On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
-
^
Sloane, N. J. A. (ed.).
"Sequence A013922 (Number of labeled connected graphs with n nodes and 0 cutpoints (blocks or nonseparable graphs))". The
On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
-
^
Sloane, N. J. A. (ed.).
"Sequence A056844 (Number of polydiamonds: polyominoes made from n diamonds)". The
On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
-
^
Sloane, N. J. A. (ed.).
"Sequence A167995 (Total number of permutations on {1,2,...,n} that have a unique longest increasing subsequence)". The
On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
-
^ Carbone, Lisa; Chung, Sjuvon; Cobbs, Leigh; Mcrae, Robert; Nandi, Debajyoti; Navqi, Yusra; Penta, Diego (March 2010).
"Classification of hyperbolic Dynkin diagrams, root lengths and Weyl group orbits" (PDF). Journal of Physics A: Mathematical and Theoretical. 43 (15): 30.
arXiv:
1003.0564.
Bibcode:
2010JPhA...43o5209C.
doi:
10.1088/1751-8113/43/15/155209.
MR
2608277.
S2CID
16946456. Retrieved 2022-11-01.
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100,000
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1,000,000
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10,000,000
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100,000,000
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1,000,000,000
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