%I A020338
%S A020338 11,22,33,44,55,66,77,88,99,1010,1111,1212,1313,1414,1515,1616,1717,1818,
%T A020338 1919,2020,2121,2222,2323,2424,2525,2626,2727,2828,2929,3030,3131,3232,
%U A020338 3333,3434,3535,3636,3737,3838,3939,4040,4141,4242,4343,4444,4545,4646
%N A020338 Doublets: base 10 representation is the juxtaposition of two identical 
               strings.
%H A020338 R. Zumkeller, <a href="b020338.txt">Table of n, a(n) for n = 1..9999</
               a>
%F A020338 a(n) = n*10^(A004216(n)+1) + n. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), 
               Aug 11 2007
%Y A020338 Sequence in context: A083852 A056524 A110745 this_sequence A052191 A110732 
               A044836
%Y A020338 Adjacent sequences: A020335 A020336 A020337 this_sequence A020339 A020340 
               A020341
%K A020338 nonn,base
%O A020338 1,1
%A A020338 David W. Wilson (davidwwilson(AT)comcast.net)