|
| |
|
|
A081247
|
|
Number of numbers k<=n with mu(k+n)=mu(k), where mu=A008683 (Moebius function).
|
|
1
| |
|
|
0, 0, 1, 2, 3, 1, 0, 5, 4, 3, 3, 7, 2, 4, 4, 10, 3, 6, 5, 12, 4, 3, 6, 16, 9, 6, 7, 13, 10, 10, 7, 16, 6, 9, 8, 25, 9, 9, 10, 22, 13, 13, 12, 19, 10, 9, 16, 29, 10, 16, 14, 24, 10, 21, 17, 31, 9, 13, 20, 37, 16, 14, 18, 30, 18, 20, 21, 35, 13, 16, 27, 49, 21, 15, 13, 42, 22, 25, 19, 39, 26
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,4
|
|
|
EXAMPLE
| n=10: mu(3+10)=mu(3)=-1, mu(7+10)=mu(7)=-1, mu(8+10)=mu(8)=0 and mu(k+10)<>mu(k) for k in {1,2,4,5,6,8,9}, therefore a(10)=3.
|
|
|
CROSSREFS
| Cf. A081248.
Sequence in context: A038554 A100329 A193535 * A173050 A172380 A144633
Adjacent sequences: A081244 A081245 A081246 * A081248 A081249 A081250
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 12 2003
|
| |
|
|
