%I A059868
%S A059868 3,9,11,12,24
%N A059868 There exist no palindromic pentagonals of length n.
%H A059868 P. De Geest, <a href="http://www.worldofnumbers.com/penta.htm">Palindromic 
               pentagonals</a>
%Y A059868 Cf. A034822, A059869, A059870, A034307, A000326, A028386, A002069.
%Y A059868 Sequence in context: A025538 A070354 A074261 this_sequence A101735 A101620 
               A116444
%Y A059868 Adjacent sequences: A059865 A059866 A059867 this_sequence A059869 A059870 
               A059871
%K A059868 nonn,base,hard
%O A059868 1,1
%A A059868 Patrick De Geest (pdg(AT)worldofnumbers.com), Feb 15 2000.