%I A068643
%S A068643 6,66,666,8778,66066,828828,6295926,61477416,178727871,6172882716,
%T A068643 87350505378,0,68742000024786,82078700787028,684866959668486,
%U A068643 8208268228628028,67898244444289876,514816979979618415
%N A068643 Largest n-digit palindromic triangular number. If no such number exists 
               then 0.
%H A068643 P. De Geest, <a href="http://www.worldofnumbers.com/em_alltria.htm">Exhaustive 
               list of Palindromic Triangulars</a>
%e A068643 a(4) = 8778 = 132*133/2 and largest 4 digit palindrome. a(12) = 0 as 
               no 12 digit palindromic triangular number exists.
%Y A068643 Cf. A068641, A068642, A068644, A000217, A003098, A008509, A008510, A054263.
%Y A068643 Sequence in context: A073549 A119087 A119212 this_sequence A119053 A119089 
               A036523
%Y A068643 Adjacent sequences: A068640 A068641 A068642 this_sequence A068644 A068645 
               A068646
%K A068643 base,nonn
%O A068643 1,1
%A A068643 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 28 2002
%E A068643 Edited by Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 24 2002.