A324045 - OEIS

%I #6 Feb 14 2019 07:46:56

%S 1,0,0,1,0,2,0,2,5,0,0,0,0,-2,-4,6,0,-6,0,-8,-8,-6,0,-4,7,-8,17,12,0,

%T -16,0,13,17,-12,15,-3,0,-14,19,6,0,6,0,8,-12,-18,0,4,9,-1,23,6,0,0,

%U 36,-8,25,-24,0,-32,0,-26,33,29,40,-10,0,2,29,-34,0,12,0,-32,37,0,40,-18,0,-24,12,-36,0,-4,48,-38,35,-36,0,-30,44,-4,37,-42,52,-16,0

%N a(n) = A000010(n) - A106316(n).

%H Antti Karttunen, <a href="/A324045/b324045.txt">Table of n, a(n) for n = 1..20000</a>

%F a(n) = A000010(n) - A106316(n).

%o (PARI)

%o A106315(n) = (n*numdiv(n) % sigma(n));

%o A106316(n) = (A106315(n) % n);

%o A324045(n) = (eulerphi(n) - A106316(n));

%Y Cf. A000005, A000010, A000203, A106316, A324046, A324047.

%K sign

%O 1,6

%A _Antti Karttunen_, Feb 13 2019