Search: id:A002069
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%I A002069 M3924 N1612
%S A002069 0,1,5,22,1001,2882,15251,720027,7081807,7451547,26811862,54177145,
%T A002069 1050660501,1085885801,1528888251,2911771192,2376574756732,5792526252975,
%U A002069 5875432345785,10810300301801,264571020175462,5292834004382925
%N A002069 Palindromic pentagonal numbers.
%D A002069 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002069 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002069 Problem E427, Amer. Math. Monthly, 48 (1941), 211-212.
%H A002069 P. De Geest, <a href="http://www.worldofnumbers.com/penta.htm">See also</
               a>
%Y A002069 Cf. A028386, A000326.
%Y A002069 Sequence in context: A115657 A066865 A005632 this_sequence A120488 A054415 
               A156328
%Y A002069 Adjacent sequences: A002066 A002067 A002068 this_sequence A002070 A002071 
               A002072
%K A002069 nonn,base
%O A002069 1,3
%A A002069 N. J. A. Sloane (njas(AT)research.att.com).

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