|
| |
|
|
A094518
|
|
Number of pairs (x,y) of divisors of n with x<y such that also x+y is a divisor of n.
|
|
3
| |
|
|
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 2, 0, 1, 0, 0, 0, 5, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 6, 0, 0, 0, 2, 0, 3, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 3, 0, 1, 0, 0, 0, 12, 0, 0, 0, 0, 0, 2, 0, 0, 0, 1, 0, 11, 0, 0, 0, 0, 0, 2, 0, 3, 0, 0, 0, 9, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 9, 0, 0, 0, 2, 0, 2
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,12
|
|
|
COMMENTS
| a(A094519(n)) > 0, a(A094520(n)) = 0.
a(A097370(n)) = n and a(m) <> n for m < A097370(n).
|
|
|
EXAMPLE
| n=30 with divisor set {1,2,3,5,6,10,15,30}: a(30)=4, as 1<2 &
3=1+2, 1<5 & 6=1+5, 2<3 & 5=2+3 and 5<10 & 15=5+10.
|
|
|
CROSSREFS
| Sequence in context: A101856 A059484 A035678 * A123074 A095269 A111417
Adjacent sequences: A094515 A094516 A094517 * A094519 A094520 A094521
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 06 2004
|
| |
|
|
