|
Search: id:A110430
|
|
|
| A110430 |
|
Arithmetic mean of all n-digit positive even numbers. |
|
+0
3
|
|
| 5, 54, 549, 5499, 54999, 549999, 5499999, 54999999, 549999999, 5499999999, 54999999999, 549999999999, 5499999999999, 54999999999999, 549999999999999, 5499999999999999, 54999999999999999, 549999999999999999, 5499999999999999999
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
FORMULA
|
a(n) =1/2{10^(n-1) + 10^n -2}
|
|
EXAMPLE
|
a(2) = Arithmetic mean of 10,12,14,...96,98 =(10 + 98)/2 =54.
|
|
CROSSREFS
|
Sequence in context: A093674 A129664 A087125 this_sequence A110432 A132619 A085719
Adjacent sequences: A110427 A110428 A110429 this_sequence A110431 A110432 A110433
|
|
KEYWORD
|
base,easy,nonn
|
|
AUTHOR
|
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 02 2005
|
|
EXTENSIONS
|
Corrected and extended by Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 10 2006
|
|
|
Search completed in 0.002 seconds
|
