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A059030 Fourth main diagonal of A059026: a(n) = B(n+3,n) = lcm(n+3,n)/(n+3) + lcm(n+3,n)/n - 1 for all n >= 1. 3

%I #8 Oct 27 2023 22:00:46

%S 4,6,2,10,12,4,16,18,6,22,24,8,28,30,10,34,36,12,40,42,14,46,48,16,52,

%T 54,18,58,60,20,64,66,22,70,72,24,76,78,26,82,84,28,88,90,30,94,96,32,

%U 100,102,34,106,108,36,112,114,38,118,120,40,124,126,42,130

%N Fourth main diagonal of A059026: a(n) = B(n+3,n) = lcm(n+3,n)/(n+3) + lcm(n+3,n)/n - 1 for all n >= 1.

%F G.f.: x(2x^3+2x^2+6x+4)/(1-x^3)^2.

%p B := (n,m) -> lcm(n,m)/n + lcm(n,m)/m - 1: seq(B(m+3,m),m=1..90);

%Y Cf. A059026, A059029, A059031.

%K nonn,easy

%O 1,1

%A _Asher Auel_, Dec 15 2000

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)