cp's OEIS Frontend

A330734 a(n) = n - A309639(n), where A309639(n) is the index of the least harmonic number H_i whose denominator (A002805) is divisible by n.

%I A330734 #7 Jan 10 2020 18:13:28
%S A330734 0,0,0,0,0,3,0,0,0,5,0,8,0,7,10,0,0,9,0,15,12,11,0,15,0,13,0,21,0,25,
%T A330734 0,0,22,17,28,27,0,19,26,32,0,33,0,33,36,23,0,32,0,25,34,39,0,27,44,
%U A330734 48,38,29,0,55,0,31,54,0,52,55,0,51,45,63,0,63,0,37,50,57,66,65,0,64,0,41,0,75,68,43,58,77,0,81
%N A330734 a(n) = n - A309639(n), where A309639(n) is the index of the least harmonic number H_i whose denominator (A002805) is divisible by n.
%H A330734 Antti Karttunen, <a href="/A330734/b330734.txt">Table of n, a(n) for n = 1..65537</a>
%F A330734 a(n) = n - A309639(n).
%o A330734 (PARI) A330734(n) = (n-A309639(n));
%Y A330734 Cf. A000961 (indices of zeros), A309639, A330691, A330692, A330735.
%K A330734 nonn
%O A330734 1,6
%A A330734 _Antti Karttunen_, Jan 10 2020