A121324 - OEIS

%I #8 Mar 14 2015 18:34:04

%S 1,19,328,4437,55546,666655,7777764,88888873,999999982,11111111091,

%T 122222222200,1333333333309,14444444444418,155555555555527,

%U 1666666666666636,17777777777777745,188888888888888854,1999999999999999963

%N Number of digits in quotient {R_(n*R_n)}/(R_n)^2, where R_n=A002275(n),n*R_n=A053422(n).

%F a(n)=round[log_10{9*(10^(n*(10^n - 1)/9) - 1)/(10^n - 1)^2}]

%t f[n_] := Floor[n(10^n - 1)/9 - 2n + Log[10, 9] + If[n == 1, 2, 1]]; Array[f, 18] (* _Robert G. Wilson v_, Aug 27 2006 *)

%K nonn,base

%O 1,2

%A _Lekraj Beedassy_, Aug 26 2006

%E More terms from _Robert G. Wilson v_, Aug 27 2006