%I A003098 M2605
%S A003098 1,3,6,55,66,171,595,666,3003,5995,8778,15051,66066,617716,828828,
%T A003098 1269621,1680861,3544453,5073705,5676765,6295926,35133153,61477416,
%U A003098 178727871,1264114621,1634004361,5289009825,6172882716,13953435931
%N A003098 Palindromic triangular numbers.
%D A003098 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003098 Charles W. Trigg, Palindromic Triangular Numbers, J. Rec. Math., 6 (1973), 
               146-147.
%D A003098 David Wells, The Penguin Dictionary of Curious and Interesting Numbers, 
               p. 73 (Rev. ed. 1997)
%H A003098 P. De Geest, <a href="http://www.worldofnumbers.com/triangle.htm">Palindromic 
               Triangulars</a>
%t A003098 Select[ Rest@FoldList[ Plus, 0, Range[ 200000 ] ], IntegerDigits[ # ]==Reverse[ 
               IntegerDigits[ # ] ]& ] - Harvey P. Dale Jan 03 2002
%Y A003098 Cf. A008509, A002113, A000217.
%Y A003098 Sequence in context: A032070 A066569 A051641 this_sequence A045914 A067610 
               A067609
%Y A003098 Adjacent sequences: A003095 A003096 A003097 this_sequence A003099 A003100 
               A003101
%K A003098 nonn,base,easy,nice
%O A003098 1,2
%A A003098 N. J. A. Sloane (njas(AT)research.att.com).