Search: id:A048983
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%I A048983
%S A048983 0,0,0,2,1,0,1,3,2,0,1,5,3,0,11,4,9,4,0,5,10,6,14,2,7,13,5,1,7,11,9,2,
%T A048983 27,6,18,10,3,25,9,21,13,1,13,19,14,31,4,14,26,7,5,16,20,16,40,5,11,32,
%U A048983 19,3,42,20,34,18,2,49,21,37,23,49,9,18
%N A048983 As n runs through composite numbers, a(n) = number of composite d < n 
               such that GCD(d,n) = 1.
%e A048983 9 is 4th composite number, GCD(9,4)=GCD(9,8)=1, so a(4) = 2.
%Y A048983 Cf. A000010, A048984.
%Y A048983 Sequence in context: A100995 A129353 A136566 this_sequence A118344 A119270 
               A078806
%Y A048983 Adjacent sequences: A048980 A048981 A048982 this_sequence A048984 A048985 
               A048986
%K A048983 easy,nonn
%O A048983 0,4
%A A048983 Naohiro Nomoto (6284968128(AT)geocities.co.jp)

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