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A060777
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Larger central (or median) divisor of n!.
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8
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1, 2, 3, 6, 12, 30, 72, 210, 630, 1920, 6336, 22176, 78975, 295680, 1144000, 4576000, 18869760, 80061696, 348986880, 1560176640, 7148445696, 33530112000, 160813154304, 787718131200, 3938590656000, 20083261440000, 104351051284480, 552173794099200, 2973519499493376, 16286922357866496, 90680032493568000, 512971179263262720
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| The integer part of square root of n! (A055226(n)) is situated between this d and its complementary divisor.
Essentially the same as A061056. - Nathaniel Johnston, Jun 25 2011
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EXAMPLE
| Divisors of 6!=720 are {1, 2, 3, 4, 5, 6, ..., 24, 30, ..., 360, 720}. a(6)=30, the 16th one from the 30 divisors of 720.
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MATHEMATICA
| Table[ Part[ Divisors[ w! ], 1+Floor[ DivisorSigma[ 0, n! ]/2 ] ], {w, a, b} ]
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CROSSREFS
| Cf. A027423, A055226, A000196, A000142, A000005.
Sequence in context: A145062 A014278 A061056 * A200744 A089430 A096746
Adjacent sequences: A060774 A060775 A060776 * A060778 A060779 A060780
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Apr 26 2001
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EXTENSIONS
| More terms from Don Reble (djr(AT)nk.ca), Dec 13 2001
Term a(1)=1 removed by Nathaniel Johnston (nathaniel(AT)nathanieljohnston.com), Jun 25 2011
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