|
| |
|
|
A128605
|
|
Smallest number m having exactly n divisors d with sqrt(m/2)<=d<sqrt(2*m).
|
|
1
| |
|
|
3, 1, 6, 72, 120, 1800, 840, 3600, 2520, 28800, 10080, 88200, 27720, 259200, 50400, 176400, 83160, 352800, 138600, 3484800, 277200, 1411200, 360360, 2822400, 831600, 3175200, 720720, 6350400, 1663200, 31363200, 1441440, 28576800
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| A067742(a(n)) = n and A067742(m) <> n for m < a(n).
|
|
|
EXAMPLE
| A067742(a(5)) = A067742(1800) = #{30,36,40,45,50} = 5;
A067742(a(6)) = A067742(840) = #{21,24,28,30,35,40} = 6;
A067742(a(7)) = A067742(3600) = #{45,48,50,60,72,75,80} = 7.
|
|
|
CROSSREFS
| Sequence in context: A157866 A025230 A152456 * A051511 A026499 A143470
Adjacent sequences: A128602 A128603 A128604 * A128606 A128607 A128608
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 14 2007
|
| |
|
|
