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A098371 #{m: GCD(n,a(m)) = Max{GCD(n,a(k)): 1<=k<n}}. 3

%I

%S 1,1,2,1,4,2,6,1,1,4,10,1,12,7,1,3,16,2,18,1,1,10,22,1,2,13,1,1,28,2,

%T 30,1,1,16,2,1,36,19,1,3,40,1,42,1,1,21,46,2,4,4,9,1,52,2,1,1,1,27,58,

%U 1,60,29,2,2,2,1,66,12,1,2,70,1,72,37,2,1,2,1,78,1,1,40,82,1,7,42,2,2,88,2,3

%N #{m: GCD(n,a(m)) = Max{GCD(n,a(k)): 1<=k<n}}.

%C a(n) = n-1 iff n = 1 or n is prime;

%C a(A098373(n)) = n and a(m) <> n for m < A098373(n);

%C a(A098374(n)) = 1;

%C a(n) = #{m: GCD(n,a(m)) = A098372(n)}.

%Y Cf. A096216, A000010.

%K nonn

%O 1,3

%A _Reinhard Zumkeller_, Sep 05 2004

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Last modified August 18 15:00 EDT 2019. Contains 326106 sequences. (Running on oeis4.)