Search: id:A028504
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%I A028504
%S A028504 0,3,8,99,323,575,4224,5775,9999,36863,42024,999999,3055503,3640463,
%T A028504 5597955,8803088,32855823,99999999,360696063,422919224,9999999999,
%U A028504 30485858403,30536863503,32154945123,59080108095,86310801368
%N A028504 Palindromes of form n(n+2); or palindromes 1 less than a square.
%H A028504 P. De Geest, <a href="http://www.worldofnumbers.com/quapron.htm">Palindromic 
               quasipronic numbers of the form n(n+2)</a>
%e A028504 4224 belongs to this sequence as 4225 = 65^2.
%o A028504 (ARIBAS): stop := 400000; m := 1; while m < stop do s := m*m - 1; if 
               s = int_reverse(s) then write(s," "); end; inc(m); end;
%Y A028504 Cf. A005563, A028503.
%Y A028504 Sequence in context: A114737 A099296 A066619 this_sequence A123279 A134803 
               A030063
%Y A028504 Adjacent sequences: A028501 A028502 A028503 this_sequence A028505 A028506 
               A028507
%K A028504 nonn,base
%O A028504 1,2
%A A028504 Patrick De Geest (pdg(AT)worldofnumbers.com)

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