%I A008510
%S A008510 1,2,3,11,77,363,1111,2662,111111,246642,11111111,363474363,
%T A008510 2664444662,26644444662,246644446642,266444444662,2466444446642,
%U A008510 3654345456545434563
%N A008510 Both n and n-th triangular number are palindromes.
%D A008510 D. Wells, The Penguin Dictionary of Curious and Interesting Numbers. 
               Penguin Books, NY, 1986, 93.
%H A008510 P. De Geest, <a href="http://www.worldofnumbers.com/subtria.htm">Subsets 
               of palindromic triangulars</a>
%H A008510 P. De Geest, <a href="http://www.worldofnumbers.com/beautiful.htm">For 
               the last term</a>
%Y A008510 Sequence in context: A001052 A155187 A109132 this_sequence A042165 A089921 
               A056899
%Y A008510 Adjacent sequences: A008507 A008508 A008509 this_sequence A008511 A008512 
               A008513
%K A008510 nonn,base
%O A008510 1,2
%A A008510 Patrick De Geest (pdg(AT)worldofnumbers.com)