%I
%S 8,9,14,16,32
%N Numbers n such that there exist no palindromic heptagonals of length n.
%H P. De Geest, <a href="http://www.worldofnumbers.com/hepta.htm">Palindromic heptagonals</a>
%Y Cf. A034822, A034307, A059868, A059870, A000566, A054971, A054910.
%K nonn,base,hard
%O 1,1
%A _Patrick De Geest_, Feb 15 2000.