|
Search: id:A095752
|
|
|
| A095752 |
|
a(n) = (1/9)*(-1+10^n)*(4*n+3) |
|
+0
1
|
|
| 7, 121, 1665, 21109, 255553, 2999997, 34444441, 388888885, 4333333329, 47777777773, 522222222217, 5666666666661, 61111111111105, 655555555555549, 6999999999999993, 74444444444444437, 788888888888888881
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Numbers with increasingly larger and larger one-digit centers.
|
|
REFERENCES
|
Discovered by Jason Earls.
|
|
FORMULA
|
O.g.f.: -x*(2*x+7)*(5*x-1)/[(-1+x)^2*(-1+10*x)^2]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 26 2008
|
|
CROSSREFS
|
Adjacent sequences: A095749 A095750 A095751 this_sequence A095753 A095754 A095755
Sequence in context: A113667 A092612 A007751 this_sequence A113267 A012028 A094088
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Michael Joseph Halm (hierogamous(AT)lycos.com), Jul 10 2004
|
|
|
Search completed in 0.002 seconds
|
