Search: id:A027692
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%I A027692
%S A027692 7,9,13,19,27,37,49,63,79,97,117,139,163,189,217,247,279,313,349,
%T A027692 387,427,469,513,559,607,657,709,763,819,877,937,999,1063,1129,1197,
%U A027692 1267,1339,1413,1489,1567,1647,1729,1813,1899,1987,2077,2169,2263
%N A027692 Numbers of form n^2 + (n+7).
%C A027692 Integers k for which the discriminant of x^3-kx-k is a square. [From 
               Jacob A. Siehler (siehlerj(AT)wlu.edu), Mar 14 2009]
%C A027692 Except for the first term, a(n)=2*n+a(n-1), (with a(1)=9) [From Vincenzo 
               Librandi (vincenzo.librandi(AT)tin.it), Oct 23 2009]
%H A027692 P. De Geest, <a href="http://www.worldofnumbers.com/quasimor.htm">Palindromic 
               Quasi_Over_Squares of the form n^2+(n+X)</a>
%F A027692 a(n)=2*n+a(n-1)-2 (with a(1)=7) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 07 2009]
%e A027692 For n=2, a(2)=2*2+7-2=9; n=3, a(3)=2*3+9-2=13; n=4, a(4)=2*4+13-2=19 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
%p A027692 with (combinat):seq(fibonacci(3, n)+n+6, n=0..47); - Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), Jun 07 2008
%Y A027692 Cf. A002522.
%Y A027692 Sequence in context: A051913 A129069 A125866 this_sequence A032487 A160777 
               A063189
%Y A027692 Adjacent sequences: A027689 A027690 A027691 this_sequence A027693 A027694 
               A027695
%K A027692 nonn,new
%O A027692 1,1
%A A027692 Patrick De Geest (pdg(AT)worldofnumbers.com)

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