%I A028386
%S A028386 1,2,4,26,44,101,693,2173,2229,4228,6010,26466,26906,31926,44059,
%T A028386 1258723,1965117,1979130,2684561,13280839,59401650,84885761,100058581,
%U A028386 225563533,316882086,700457153,818049201,851649306,1345679688
%N A028386 Numbers n such that n(3n-1)/2 is a pentagonal palindrome.
%H A028386 P. De Geest, <a href="http://www.worldofnumbers.com/penta.htm">Palindromic 
               Pentagonals</a>
%Y A028386 Cf. A002069, A000326.
%Y A028386 Sequence in context: A162118 A128774 A129894 this_sequence A155120 A144691 
               A085700
%Y A028386 Adjacent sequences: A028383 A028384 A028385 this_sequence A028387 A028388 
               A028389
%K A028386 nonn,base
%O A028386 1,2
%A A028386 Patrick De Geest (pdg(AT)worldofnumbers.com), extended 11/98.