|
| |
|
|
A120927
|
|
Floor[semiprime(n)/n].
|
|
1
| |
|
|
4, 3, 3, 2, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 2, 2, 3, 3, 2, 3, 3, 2, 2, 2, 3, 3, 3, 2, 3, 3, 3, 3, 3, 3
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| The ratio is an integer for n = 1, 2, 3, 11, 43, 53, ...
|
|
|
FORMULA
| a(n) = floor[A001358(n)/n].
|
|
|
EXAMPLE
| a(1) = floor[4/1] = 4 because 4 is the first semiprime.
a(2) = floor[6/2] = 3 because 6 is the second semiprime.
a(3) = floor[9/3] = 3 because 9 is the third semiprime.
a(4) = floor[10/4] = 2 because 4 is the fourth semiprime.
|
|
|
CROSSREFS
| Cf. A001358.
Sequence in context: A019975 A196274 A073871 * A117323 A016502 A117691
Adjacent sequences: A120924 A120925 A120926 * A120928 A120929 A120930
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 18 2006
|
| |
|
|
