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A096533 Number of composite numbers not greater than the n-th composite number that divide at least one other number not greater than the n-th composite number. 1

%I #3 Mar 30 2012 18:50:44

%S 0,0,1,1,1,2,2,2,3,4,5,5,5,6,6,6,6,7,8,9,9,9,9,10,10,10,11,12,13,13,

%T 13,14,14,15,15,16,17,17,18,18,18,19,19,19,20,20,21,22,22,23,24,24,24,

%U 25,25,26,27,27,27,28,28,28,28,29,30,30,31,31,31,31,32,33,33,34,35,36

%N Number of composite numbers not greater than the n-th composite number that divide at least one other number not greater than the n-th composite number.

%C a(n) = A065855(floor(A002808(n)/2));

%C A096532(n) + a(n) = n.

%K nonn

%O 1,6

%A _Reinhard Zumkeller_, Jun 23 2004

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Last modified March 28 16:34 EDT 2024. Contains 371254 sequences. (Running on oeis4.)