Search: id:A158642
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%I A158642
%S A158642 0,1,4,9,121,252,484,10201,12321,14641,20502,23632,26962,40804,44944,
%T A158642 1002001,1113111,1226221,1234321,1357531,2005002,2126212,2216122,
%U A158642 2249422,2347432,2429242,4008004,4229224,100020001
%N A158642 Palindromic numbers which are the product of a number n and its reversal 
               (n written backwards)
%C A158642 Apart from 3 which produces 9 (3*3), all the other numbers n which satisfy 
               the definition are formed by digits 0, 1 and 2 only. Subset of A002113.
%C A158642 Every term has an odd number of digits. - Floris van Doorn, Sep 25 2009
%H A158642 Floris P. van Doorn, <a href="b047999.txt">Table of n, a(n) for n=0,...,
               10126</a> (every term with at most 27 digits)
%e A158642 0*0=0; 1*1=1; 2*2=4; 3*3=9; 11*11=121; 12*21=252; 22*22=484; 101*101=10201; 
               102*201=20502; etc.
%Y A158642 Cf. A002113
%Y A158642 Sequence in context: A156317 A115676 A115667 this_sequence A131760 A002779 
               A028817
%Y A158642 Adjacent sequences: A158639 A158640 A158641 this_sequence A158643 A158644 
               A158645
%K A158642 easy,nonn,base
%O A158642 0,3
%A A158642 Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Mar 23 2009
%E A158642 Corrected by Floris van Doorn (florisvandoorn(AT)hotmail.com), Sep 25 
               2009

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