%I A054971
%S A054971 1,2,5,16,38,44,156,583,1359,1470,1556,53537,158476,161656,171657,
%T A054971 190914,371778,382173,615769,1207698,1686537,16943262,88274141,
%U A054971 496329416,765609041,1820198063,2497949426,2850685772,15911875336
%N A054971 n(5n-3)/2 is a palindromic heptagonal number.
%H A054971 P. De Geest, <a href="http://www.worldofnumbers.com/hepta.htm">Palindromic 
               Heptagonals</a>
%Y A054971 Cf. A054910, A000566.
%Y A054971 Sequence in context: A139022 A053683 A082085 this_sequence A124720 A076958 
               A163825
%Y A054971 Adjacent sequences: A054968 A054969 A054970 this_sequence A054972 A054973 
               A054974
%K A054971 nonn,base
%O A054971 1,2
%A A054971 Jeffrey Heleen (meriadoc(AT)cheshire.net), May 26 2000