OFFSET
1,1
REFERENCES
J. Earls, On Smarandache Repunit N Numbers, Smarandache Notions Journal (2004), Vol. 14.1, pp 251-258.
FORMULA
a(n) = n*10^n+(10^n-1)/9.
G.f.: x*(11-20*x)/((1-x)*(1-20*x+100*x^2)). a(n)=20*a(n-1)-100*a(n-2)-9, n>1. - Michael Somos, Oct 29, 2002
MAPLE
MATHEMATICA
Table[n*10^n+(10^n-1)/9, {n, 50}] (* Wesley Ivan Hurt, Nov 23 2013 *)
PROG
(PARI) a(n)=if(n<1, 0, n*10^n+(10^n-1)/9)
CROSSREFS
KEYWORD
easy,nonn,less
AUTHOR
Jason Earls, Oct 15 2002
STATUS
approved