Search: id:A028875
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%I A028875
%S A028875 4,11,20,31,44,59,76,95,116,139,164,191,220,251,284,319,356,395,436,
%T A028875 479,524,571,620,671,724,779,836,895,956,1019,1084,1151,1220,1291,
%U A028875 1364,1439,1516,1595,1676,1759,1844,1931,2020,2111,2204,2299,2396
%N A028875 n^2 - 5.
%H A028875 P. De Geest, <a href="http://www.worldofnumbers.com/consemor.htm">Palindromic 
               Quasipronics of the form n(n+x)</a>
%H A028875 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Near-SquarePrime.html">Near-Square Prime</a>
%F A028875 O.g.f.: x^3*(-4+x+x^2)/(-1+x)^3 . a(n) = 3a(n-1)-3a(n-2)+a(n-3). - R. 
               J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 28 2008
%F A028875 a(n)=2*n+a(n-1)+3 (with a(1)=4) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 07 2009]
%e A028875 For n=2, a(2)=2*2+4+3=11; n=3, a(3)=2*3+11+3=20; n=4, a(4)=2*4+20+3=31 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
%p A028875 with(combinat, fibonacci):seq(fibonacci(3, i)-6,i=3..49); - Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Mar 20 2008
%t A028875 lst={};Do[AppendTo[lst, n^2-5], {n, 0, 6!, 1}];lst [From Vladimir Orlovsky 
               (4vladimir(AT)gmail.com), Nov 07 2008]
%o A028875 (Other) SAGE:[lucas_number2(2,n,2-n) for n in xrange(2,49)]# [From Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Mar 12 2009]
%Y A028875 Sequence in context: A047962 A047961 A159801 this_sequence A008245 A002441 
               A008053
%Y A028875 Adjacent sequences: A028872 A028873 A028874 this_sequence A028876 A028877 
               A028878
%K A028875 nonn
%O A028875 3,1
%A A028875 Patrick De Geest (pdg(AT)worldofnumbers.com)

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