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A061300
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Least number such that number of divisors is n!.
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2
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1, 1, 2, 12, 360, 55440, 61261200, 293318625600, 6064949221531200, 1315675499575984747200, 1130066578473302698988760000, 8029566026151577210973143393920000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| a(n) = A037019(n!) for all n <= 12 except 4. I conjecture that this remains true for all larger n, i.e. 4! is the only "exceptional" factorial (see A037019). - David Wasserman (wasserma(AT)spawar.navy.mil), Jun 13 2002
Alternate definition: smallest number with same number of divisors as A006939 - J. Lowell (jhbubby(AT)mindspring.com), May 20 2008
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FORMULA
| A005179(n!)=a(n), for example A005179(120)=55440
a(n)=Min{x| A000005[x]=n!}, for example A000005(55440)=120 and 55440 is minimal.
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EXAMPLE
| a(3) = 12 and tau(12) = 6 = 3!
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CROSSREFS
| Cf. A000005, A005179, A007304, A006939, A037019, A000142, A072066, A009287.
Cf. A140635.
Sequence in context: A012724 A012624 A061307 * A079264 A006939 A152686
Adjacent sequences: A061297 A061298 A061299 * A061301 A061302 A061303
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com) and Labos E. (labos(AT)ana.sote.hu), Apr 26 2001
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jun 13 2002
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