Search: id:A028553
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%I A028553
%S A028553 0,1,8,28,66,88,211,298,671,2126,2998,28814,29369,29998,63701,212206,
%T A028553 212671,299998,636776,2122206,2861419,2999998,9443423,21341691,
%U A028553 28862883,29999998,212325206,289053683,294127328,294174669,299999998
%N A028553 Numbers n such that n(n+3) is a palindrome.
%C A028553 Also: sum of the first n even composites is palindromic. Sequence is 
               4 + 6 + 8 + 10 + 12 + 14 + ... + z. For values of z see A058851. 
               (Comment added by author 12/2000).
%H A028553 P. De Geest, <a href="http://www.worldofnumbers.com/consemor.htm">Palindromic 
               Quasipronics</a>
%H A028553 P. De Geest, <a href="http://www.worldofnumbers.com/firstpal.htm#sfn5">
               Palindromic Sums 2</a>
%Y A028553 Cf. A058851, A028554.
%Y A028553 Sequence in context: A007259 A134747 A083013 this_sequence A100182 A119515 
               A153976
%Y A028553 Adjacent sequences: A028550 A028551 A028552 this_sequence A028554 A028555 
               A028556
%K A028553 nonn,base
%O A028553 1,3
%A A028553 Patrick De Geest (pdg(AT)worldofnumbers.com)

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