Search: id:A028557
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%I A028557
%S A028557 0,6,14,24,36,50,66,84,104,126,150,176,204,234,266,300,336,374,414,
%T A028557 456,500,546,594,644,696,750,806,864,924,986,1050,1116,1184,1254,
%U A028557 1326,1400,1476,1554,1634,1716,1800,1886,1974,2064,2156
%N A028557 n(n+5).
%H A028557 P. De Geest, <a href="http://www.worldofnumbers.com/consemor.htm">Palindromic 
               Quasipronics of the form n(n+x)</a>
%F A028557 a(n)=2*n+a(n-1)+2 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 07 2009]
%e A028557 For n=2, a(2)=2*2+0+2=6; n=3, a(3)=2*3+6+2=14; n=4, a(4)=2*4+14+2=24 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
%p A028557 a:=n->sum(n,j=6..n): seq(a(n), n=5..49); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Feb 12 2007
%p A028557 with (combinat):seq(fibonacci(3, n)+n-7, n=2..46); - Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), Jun 07 2008
%p A028557 a:=n->sum(1+sum(1, k=1..n),k=5..n):seq(a(n), n=4...48); - Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), Jun 22 2008
%p A028557 a:=n->sum(k, k=0..n):seq(a(n)+sum(k, k=4..n), n=2..46); - Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), Jun 22 2008
%p A028557 with(finance):seq(add(cashflows([2,k,k], 0 ),k=2..n),n=1..51); - Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Jun 22 2008
%t A028557 s=0;lst={s};Do[s+=n++ +6;AppendTo[lst, s], {n, 0, 6!, 2}];lst [From Vladimir 
               Orlovsky (4vladimir(AT)gmail.com), Nov 16 2008]
%Y A028557 Cf. A104675.
%Y A028557 Cf. A002522.
%Y A028557 Sequence in context: A120345 A107400 A104675 this_sequence A083657 A010740 
               A095794
%Y A028557 Adjacent sequences: A028554 A028555 A028556 this_sequence A028558 A028559 
               A028560
%K A028557 nonn
%O A028557 0,2
%A A028557 Patrick De Geest (pdg(AT)worldofnumbers.com)

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