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 A109046 a(n) = lcm(n, 5). 3

%I

%S 0,5,10,15,20,5,30,35,40,45,10,55,60,65,70,15,80,85,90,95,20,105,110,

%T 115,120,25,130,135,140,145,30,155,160,165,170,35,180,185,190,195,40,

%U 205,210,215,220,45,230,235,240,245,50,255,260,265,270,55,280,285,290

%N a(n) = lcm(n, 5).

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,2,0,0,0,0,-1)

%F a(n) = n*5/gcd(n, 5) = 5*n/A109009(n) = 5*A060791(n).

%F G.f.: 5*x*(x^4+x^3+3*x^2+x+1)*(x^4+x^3-x^2+x+1) / ( (x-1)^2*(x^4+x^3+x^2+x+1)^2 ). - _R. J. Mathar_, Apr 18 2011

%o (Sage) [lcm(n,5)for n in xrange(0, 59)] # _Zerinvary Lajos_, Jun 07 2009

%o (MAGMA) [Lcm(n,5): n in [0..100]]; // _Vincenzo Librandi_, Apr 18 2011

%Y Cf. A109042.

%K nonn,easy

%O 0,2

%A _Mitch Harris_, Jun 18 2005

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Last modified March 20 22:18 EDT 2018. Contains 300991 sequences. (Running on oeis4.)