Search: id:A125749
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%I A125749
%S A125749 1,2,2,2,3,2,4,3,4,3,5,3,5,4,5,4,6,4,6,4,6,5,7,4,7,6,6,5,8,4,8,6,7,6,8,
%T A125749 5,9,7,8,6,9,5,9,7,7,7,10,6,10,7,9,8,10,6,10,7,9,8,11,6,11,8,9,8,11,7,
%U A125749 12,9,10,7,12,7,12,9,9,9,12,7,13,8,11,10,13,7,12,10,11,9,13,7,13,10,12
%N A125749 a(n) is the smallest positive integer such that (sum{1<=k<=a(n), GCD(t(k),
               n)=1} t(k)) is >= n, where t(k) is the k-th positive integer which 
               is coprime to n.
%H A125749 Leroy Quet, <a href="http://www.prism-of-spirals.net/">Home Page</a> 
               (listed in lieu of email address)
%e A125749 The positive integers which are coprime to 12 are 1,5,7,11,13,... Now 
               1+5 = 6, which is less than 12; but 1+5+7 is 13, which is >= 12. 
               7 is the 3rd positive integer which is coprime to 12, so a(12) = 
               3.
%t A125749 f[n_] := Block[{k = 1, l},While[l = Select[Range[k], GCD[ #, n] == 1 
               &]; Plus @@ l < n, k++ ];Length[l]];Table[f[n], {n, 100}] (*Chandler*)
%Y A125749 Cf. A125748, A117893.
%Y A125749 Sequence in context: A036013 A126336 A134446 this_sequence A014085 A029210 
               A035433
%Y A125749 Adjacent sequences: A125746 A125747 A125748 this_sequence A125750 A125751 
               A125752
%K A125749 nonn
%O A125749 1,2
%A A125749 Leroy Quet Dec 06 2006
%E A125749 Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 11 2006

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