Search: id:A027688
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%I A027688
%S A027688 3,5,9,15,23,33,45,59,75,93,113,135,159,185,213,243,275,309,345,383,
%T A027688 423,465,509,555,603,653,705,759,815,873,933,995,1059,1125,1193,
%U A027688 1263,1335,1409,1485,1563,1643,1725,1809,1895,1983,2073,2165,2259
%N A027688 n^2 + n + 3.
%C A027688 Except for the first term, a(n)=2*n+a(n-1), (with a(1)=5) [From Vincenzo 
               Librandi (vincenzo.librandi(AT)tin.it), Oct 23 2009]
%H A027688 P. De Geest, <a href="http://www.worldofnumbers.com/quasimor.htm">Palindromic 
               Quasi_Over_Squares of the form n^2+(n+X)</a>
%F A027688 a(n)=2*n+a(n-1)-2 (with a(1)=3) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 07 2009]
%e A027688 For n=2, a(2)=2*2+3-2=5; n=3, a(3)=2*3+5-2=9; n=4, a(4)=2*4+9-2=15 [From 
               Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
%p A027688 with (combinat):seq(fibonacci(3, n)+n+2, n=0..47); - Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), Jun 07 2008
%t A027688 lst={};a=3;Do[a=2*n+a;AppendTo[lst, a], {n, 0, 5!}];lst...and/or... lst={};
               Do[a=n^2+n+3;AppendTo[lst, a], {n, 0, 5!}];lst [From Vladimir Orlovsky 
               (4vladimir(AT)gmail.com), Oct 01 2008]
%Y A027688 Cf. A002522.
%Y A027688 Sequence in context: A095039 A022940 A025207 this_sequence A118403 A033498 
               A147493
%Y A027688 Adjacent sequences: A027685 A027686 A027687 this_sequence A027689 A027690 
               A027691
%K A027688 nonn,new
%O A027688 0,1
%A A027688 Patrick De Geest (pdg(AT)worldofnumbers.com)
%E A027688 Definition and offset fixed by Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), 
               Jul 06 2009

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