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A128558 a(n) = the number of positive divisors of (n!/A128557(n)!). 2
1, 2, 4, 6, 6, 8, 8, 8, 12, 12, 24, 12, 24, 32, 16, 20, 40, 36, 24, 48, 24, 64, 32, 40, 48, 60, 48, 64, 48, 64, 32, 56, 48, 56, 64, 36, 72, 48, 128, 80, 64, 80, 160, 64, 72, 96, 48, 48, 60, 108, 72, 96, 192, 64, 64, 160, 128, 80, 160, 64, 128, 64, 256, 96, 168, 128, 256, 256 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(n) is >= n, for each positive integer n.
LINKS
MAPLE
A128557 := proc(n) local A, k: A:={}: for k from 1 to n do if numtheory[tau](n!/k!)>=n then A:=A union {k} else A:=A fi od: A[nops(A)]; end: A128558 := proc(n) numtheory[tau]( n!/A128557(n)!) ; end: seq(A128558(n), n=1..80) ; # R. J. Mathar, Oct 09 2007
CROSSREFS
Cf. A128557.
Sequence in context: A349787 A161655 A092517 * A090346 A267460 A092989
KEYWORD
nonn
AUTHOR
Leroy Quet, Mar 10 2007
EXTENSIONS
More terms from R. J. Mathar, Oct 09 2007
STATUS
approved

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Last modified March 29 11:14 EDT 2024. Contains 371278 sequences. (Running on oeis4.)