%I A046193
%S A046193 1,5,221,1513,71065,487085,22882613,156839761,7368130225,50501915861,
%T A046193 2372515049741,16261460067385,763942477886281,5236139639782013,
%U A046193 245987105364332645,1686020702549740705,79207083984837225313
%N A046193 Indices of heptagonal numbers (A000566) which are also triangular.
%H A046193 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               HeptagonalTriangularNumber.html">Link to a section of The World of 
               Mathematics.</a>
%F A046193 For n odd, a(n+2)=322*a(n+1)-a(n)-96; for n even, a(n+1)=161*a(n)-48+36*(20*a(n)^2-12*a(n)+1)^0.5 
               - Richard Choulet (richardchoulet(AT)yahoo.fr), Sep 29 2007, Oct 
               09 2007
%Y A046193 Cf. A039835, A046194.
%Y A046193 Cf. A039835 A046194.
%Y A046193 Sequence in context: A024070 A050617 A066462 this_sequence A112999 A002142 
               A103732
%Y A046193 Adjacent sequences: A046190 A046191 A046192 this_sequence A046194 A046195 
               A046196
%K A046193 nonn
%O A046193 1,2
%A A046193 Eric Weisstein (eric(AT)weisstein.com)