Search: id:A027689
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%I A027689
%S A027689 4,6,10,16,24,34,46,60,76,94,114,136,160,186,214,244,276,310,346,
%T A027689 384,424,466,510,556,604,654,706,760,816,874,934,996,1060,1126,1194,
%U A027689 1264,1336,1410,1486,1564,1644,1726,1810,1896,1984,2074,2166,2260
%N A027689 Numbers of form n^2 + (n+4).
%C A027689 Except for the first term, a(n)=2*n+a(n-1), (with a(1)=6) [From Vincenzo 
               Librandi (vincenzo.librandi(AT)tin.it), Oct 23 2009]
%H A027689 P. De Geest, <a href="http://www.worldofnumbers.com/quasimor.htm">Palindromic 
               Quasi_Over_Squares of the form n^2+(n+X)</a>
%F A027689 a(n)=A000217(n-2)+A000217(n+2) for n>0. - Jon Perry (perry(AT)globalnet.co.uk), 
               Jul 23 2003
%F A027689 a(n)=2*n+a(n-1)-2 (with a(1)=4) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 07 2009]
%e A027689 For n=2, a(2)=2*2+4-2=6; n=3, a(3)=2*3+6-2=10; n=4, a(4)=2*4+10-2=16 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
%p A027689 with (combinat):seq(fibonacci(3, n)+n+3, n=0..47); - Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), Jun 07 2008
%Y A027689 Cf. A002522.
%Y A027689 Sequence in context: A076529 A102768 A075637 this_sequence A023501 A050887 
               A078642
%Y A027689 Adjacent sequences: A027686 A027687 A027688 this_sequence A027690 A027691 
               A027692
%K A027689 nonn
%O A027689 1,1
%A A027689 Patrick De Geest (pdg(AT)worldofnumbers.com)

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