|
| |
|
|
A123258
|
|
a(n) = n-th divisor of the smallest positive integer with at least n divisors.
|
|
1
| |
|
|
1, 2, 4, 6, 6, 12, 12, 24, 36, 48, 30, 60, 30, 40, 60, 120, 90, 180, 120, 240, 90, 120, 180, 360, 120, 144, 180, 240, 360, 720, 420, 840, 315, 420, 630, 1260, 420, 560, 840, 1680, 315, 360, 420, 504, 630, 840, 1260, 2520, 360, 420, 504, 560, 630, 720, 840, 1008
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| a(n) = n-th divisor of A061799(n).
|
|
|
EXAMPLE
| The smallest positive integer with at least 11 divisors is 60, which has 12 divisors.
So a(11) = the 11th divisor of 60, which is 30.
|
|
|
MATHEMATICA
| f[n_] := Block[{k = 1, d}, While[d = Divisors[k]; Length[d] < n, k++ ]; d[[n]]]; Table[f[n], {n, 60}] (*Chandler*)
Do[k = 1; While[Length[Divisors[k]] < n, k++ ]; Print[Divisors[k][[n]]], {n, 100}] - Ryan Propper (rpropper(AT)stanford.edu), Nov 12 2006
|
|
|
CROSSREFS
| Cf. A061799.
Sequence in context: A066820 A141677 A087459 * A104968 A142473 A132426
Adjacent sequences: A123255 A123256 A123257 * A123259 A123260 A123261
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Leroy Quet Nov 06 2006
|
|
|
EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 11 2006
More terms from Ryan Propper (rpropper(AT)stanford.edu), Nov 12 2006
|
| |
|
|
