Search: id:A028569
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%I A028569
%S A028569 0,10,22,36,52,70,90,112,136,162,190,220,252,286,322,360,400,442,
%T A028569 486,532,580,630,682,736,792,850,910,972,1036,1102,1170,1240,1312,
%U A028569 1386,1462,1540,1620,1702,1786,1872,1960,2050,2142,2236,2332,2430
%N A028569 n(n+9).
%H A028569 P. De Geest, <a href="http://www.worldofnumbers.com/consemor.htm">Palindromic 
               Quasipronics of the form n(n+x)</a>
%F A028569 Equals 2*A056000 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 
               12 2007
%F A028569 a(n)=2*n+a(n-1)+6 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 08 2009]
%e A028569 For n=2, a(2)=2*2+0+6=10; n=3, a(3)=2*3+10+6=22; n=4, a(4)=2*4+22+6=36 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009]
%p A028569 a:=n->sum(n,j=10..n): seq(a(n), n=9..54); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Feb 12 2007
%p A028569 with(finance):seq(add(cashflows([2,k,k], 0 ),k=4..n),n=3..51); - Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Jun 30 2008
%t A028569 s=0;lst={s};Do[s+=n++ +10;AppendTo[lst, s], {n, 0, 6!, 2}];lst [From 
               Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 17 2008]
%Y A028569 Sequence in context: A109958 A053361 A017641 this_sequence A014367 A063710 
               A157917
%Y A028569 Adjacent sequences: A028566 A028567 A028568 this_sequence A028570 A028571 
               A028572
%K A028569 nonn,new
%O A028569 0,2
%A A028569 Patrick De Geest (pdg(AT)worldofnumbers.com)

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