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A160996 a(n) = the smallest positive integer with exactly the same number of divisors as in the first n positive integers combined. 0
1, 4, 16, 24, 48, 192, 120, 240, 4194304, 900, 268435456, 5184, 68719476736, 1099511627776, 3600, 6480, 61440, 805306368, 5040, 46080, 25920, 206158430208, 3932160, 20160, 2415919104, 2985984, 21233664, 1267650600228229401496703205376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = the smallest positive integer with exactly sum{k=1 to n} d(k) (or sum{k=1 to n} floor(n/k)) divisors.

LINKS

Table of n, a(n) for n=1..28.

FORMULA

a(n) = A005179(A006218(n)).

CROSSREFS

Cf. A005179, A006218.

Sequence in context: A192199 A145229 A174999 * A173926 A305884 A239522

Adjacent sequences:  A160993 A160994 A160995 * A160997 A160998 A160999

KEYWORD

nonn

AUTHOR

Leroy Quet, Jun 01 2009

EXTENSIONS

Extended by Ray Chandler, Jun 13 2009

STATUS

approved

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Last modified October 22 09:56 EDT 2019. Contains 328315 sequences. (Running on oeis4.)