%I A139768
%S A139768 21,38,57,58,71,81,127,148,164,181,188,195,204,208,209,212,232,244,249,
%T A139768 250,251,252,267,269,270,300,317,326,356,357,382,398,407,409,416,417,
%U A139768 420,447,448,453,471,479,480,481,492,502,505,528,530,548,554,561,570
%N A139768 Numbers n such that (10^(n+1) mod 9^(n+1))/(10^n mod 9^n)=10, or A139739(n+1)/
               A139739(n)=10.
%C A139768 Also, this is the set of numbers n such that 9*floor((10/9)^(n+1))==10*floor((10/
               9)^n) (cf. A065566). For proof see Mathar link.
%H A139768 R. J. Mathar, <a href="a139768.txt">Proof of alternative characterization.</
               a>
%Y A139768 Cf. A139739, A065566.
%Y A139768 Sequence in context: A109211 A050782 A061906 this_sequence A072708 A102478 
               A020220
%Y A139768 Adjacent sequences: A139765 A139766 A139767 this_sequence A139769 A139770 
               A139771
%K A139768 nonn
%O A139768 1,1
%A A139768 Zak Seidov (zakseidov(AT)yahoo.com) and N. J. A. Sloane (njas(AT)research.att.com), 
               May 20 2008, May 24 2008