|
| |
|
|
A178031
|
|
Consider the Farey tree A006842/A006843; a(n) = row at which the denominator n first appears (assumes first row is labeled row 1).
|
|
3
|
|
|
|
1, 2, 3, 4, 4, 6, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 7, 8, 8, 8, 8, 8, 8, 9, 8, 8, 8, 9, 9, 8, 9, 9, 9, 10, 9, 9, 9, 10, 9, 9, 9, 9, 9, 10, 9, 9, 10, 10, 10, 11, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
COMMENTS
|
Computed by Alan Wechsler, Dec 16, 2010.
Rich Schroeppel also asked about the analogous sequence giving the last occurrence of denominator n.
|
|
|
REFERENCES
|
Based on a posting by Rich Schroeppel to the Math Fun Mailing List, Dec 15 2010.
|
|
|
LINKS
|
Bo Gyu Jeong, Table of n, a(n) for n = 1..10000
|
|
|
CROSSREFS
|
See A178047 for another version. Cf. A006842, A006843, A177903, A178042.
Sequence in context: A180046 A008329 A064558 * A008328 A091860 A181833
Adjacent sequences: A178028 A178029 A178030 * A178032 A178033 A178034
|
|
|
KEYWORD
|
nonn,more
|
|
|
AUTHOR
|
N. J. A. Sloane, Dec 16 2010
|
|
|
EXTENSIONS
|
More terms from Bo Gyu Jeong, Oct 20 2012
|
|
|
STATUS
|
approved
|
| |
|
|
