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A120112 Row sums of number triangle A120111. 5

%I

%S 1,-1,-2,-1,-4,0,-6,-1,-2,0,-10,0,-12,0,0,-1,-16,0,-18,0,0,0,-22,0,-4,

%T 0,-2,0,-28,0,-30,-1,0,0,0,0,-36,0,0,0,-40,0,-42,0,0,0,-46,0,-6,0,0,0,

%U -52,0,0,0,0,0,-58,0,-60,0,0,-1,0,0,-66,0,0,0,-70,0,-72

%N Row sums of number triangle A120111.

%C The last row of the columns in tables A133232 and A133233 are given by this sequence via the formula: if n < k + k*abs(a(n)) then k, otherwise 1 (1 <= k <= n). - _Mats Granvik_, Jan 22 2008

%H Muniru A Asiru, <a href="/A120112/b120112.txt">Table of n, a(n) for n = 0..5000</a>

%F a(n) = 1 - lcm(1,...,n+1)/lcm(1,...,n) for n > 0.

%F a(n) = 1 - A014963(n+1). - _Joerg Arndt_, Sep 12 2016

%o (PARI) a(n) = if (n==0, 1, 1 - lcm(vector(n+1, k, k))/lcm(vector(n, k, k))); \\ _Michel Marcus_, Sep 11 2016

%o (GAP) Concatenation([1],List([1..70],n->1-Lcm(List([1..n+1],i->i))/Lcm(List([1..n],i->i)))); # _Muniru A Asiru_, Mar 04 2019

%Y Cf. A014963, A120111, A133232, A133233.

%K easy,sign

%O 0,3

%A _Paul Barry_, Jun 09 2006

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Last modified April 9 06:59 EDT 2020. Contains 333344 sequences. (Running on oeis4.)