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%I #9 Apr 29 2019 14:46:51
%S 1,2,6,12,17,44,74,139,1123,1411,2101,4070,11323,11472,12870,16318,
%T 16853,18729,52642,132619,435644,446904,168566853,350096787,521037077,
%U 708609429,1121857192,1641773578,11947307367,21633254881,75356090494
%N Base numbers of 9-gonal palindromic numbers.
%H P. De Geest, <a href="http://www.worldofnumbers.com/nona.htm">Palindromic nonagonals</a>
%F 9-gonal numbers are of the form (n(7n-5))/2.
%t Select[Range[0, 10^5], PalindromeQ[PolygonalNumber[9, #]] &] (* _Robert Price_, Apr 29 2019 *)
%Y Cf. A001106, A082723.
%K nonn,base
%O 1,2
%A _J. Lowell_, Jul 10 2000
%E Edited and extended by _Patrick De Geest_, Apr 13 2003.
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