OFFSET
1,1
COMMENTS
Subsidiary sequence: Average of positive multiples of k with n decimal digits, rounded down.
FORMULA
For n > 1, a(n+1) = 10 * a(n).
EXAMPLE
a(2) = average {12,15,...96,99} = floor((12+99)/2) = 55.
PROG
(PARI) a(n)=(11*10^(n-1)+1)\2
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Amarnath Murthy, Aug 02 2005
EXTENSIONS
Corrected and extended by Joshua Zucker, May 10 2006
Formula and program from Charles R Greathouse IV, Aug 03 2010
STATUS
approved