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A181643 a(n) is the smallest value such that a(n)*[a(n)+n]*[a(n)+n+n]=y^2 is a perfect square 1

%I

%S 0,0,0,0,40,6,18,0,0,0,0,0,0,4,10,0,0,0,0,5,7,0,0,1,0,0,0,72,0,15,0,0,

%T 0,128,0,0,0,0,936,0,800,0,0,0,360,196,0,0,0,0,0,0,0,54

%N a(n) is the smallest value such that a(n)*[a(n)+n]*[a(n)+n+n]=y^2 is a perfect square

%C For a given n there is more than one solution.

%e a(5)=40 since 40*(40+5)*(40+5+5)=40*45*50=90000=300^2

%Y Cf. A115878, A181646.

%K nonn

%O 1,5

%A _Carmine Suriano_, Nov 03 2010, corrected Nov 10 2010

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Last modified May 23 07:00 EDT 2019. Contains 323508 sequences. (Running on oeis4.)