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A081833
a(n) is the smallest number that can be expressed as the product of three positive integers in n distinct ways, or 0 if no such number exists.
1
1, 4, 8, 12, 30, 24, 64, 36, 48, 60, 0, 72, 0, 210, 0, 120, 0, 144, 216, 180, 8192, 0, 0, 240, 768, 0, 32768, 420, 0, 1536, 0, 360, 480, 0, 0, 3072, 262144, 864, 0, 900, 2310, 1296, 0, 960, 0, 840, 0, 720, 12288, 2304, 1728, 1080, 0, 0, 0, 1260, 2592, 0, 0, 4608, 16777216
OFFSET
1,2
COMMENTS
Sequence corresponds to the first occurrence of n in A034836.
EXAMPLE
a(4)=12 since we have 12 = 1*1*12 = 1*2*6 = 1*3*4 = 2*2*3, and 12 is the smallest number that written as the product of 3 positive integers in 4 ways.
CROSSREFS
Cf. A034836.
Sequence in context: A102110 A302829 A055079 * A370134 A035403 A050908
KEYWORD
nonn
AUTHOR
Lekraj Beedassy, Apr 11 2003
EXTENSIONS
Edited and extended by Ray Chandler, Dec 17 2008
Definition corrected by Harvey P. Dale, Mar 30 2019
STATUS
approved