|
Search: id:A038549
|
|
|
| A038549 |
|
Least number with exactly n divisors that are at most its square root. |
|
+0
5
|
|
| 1, 4, 12, 24, 36, 60, 192, 120, 180, 240, 576, 360, 1296, 900, 720, 840, 9216, 1260, 786432, 1680, 2880, 15360, 3600, 2520, 6480, 61440, 6300, 6720, 2359296, 5040, 3221225472, 7560, 46080, 983040, 25920, 10080, 206158430208, 32400, 184320
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Least number of identical objects that can be arranged in exactly n ways in a rectangle, modulo rotation
Smallest number which has n distinct unordered factorizations of the form x*y. - Lekraj Beedassy (blekraj(AT)yahoo.com), Jan 09 2008
|
|
LINKS
|
T. Verhoeff, Rectangular and Trapezoidal Arrangements, J. Integer Sequences, Vol. 2, 1999, #99.1.6.
|
|
FORMULA
|
a(n) = min(A005179(2n-1), A005179(2n)).
|
|
CROSSREFS
|
Records in A038548. Cf. A038548, A072671, A004778, A086921.
Sequence in context: A008103 A086921 A004778 this_sequence A008081 A008188 A057322
Adjacent sequences: A038546 A038547 A038548 this_sequence A038550 A038551 A038552
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Tom Verhoeff (Tom.Verhoeff(AT)acm.org)
|
|
EXTENSIONS
|
More terms from David W. Wilson (davidwwilson(AT)comcast.net).
|
|
|
Search completed in 0.002 seconds
|
