login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Möbius transform of A320107.
2

%I #5 Nov 22 2018 18:16:43

%S 1,0,0,0,1,1,1,0,0,0,1,0,1,0,0,0,1,1,1,0,0,0,1,0,1,0,0,0,1,1,1,0,0,0,

%T 1,0,1,0,0,0,1,1,1,0,0,0,1,0,1,0,0,0,1,1,1,0,0,0,1,0,1,0,0,0,1,1,1,0,

%U 0,0,1,0,1,0,0,0,1,1,1,0,0,0,1,0,1,0,0,0,1,1,1,0,0,0,1,0,1,0,0,0,1,1,1,0,0

%N Möbius transform of A320107.

%H Antti Karttunen, <a href="/A320106/b320106.txt">Table of n, a(n) for n = 1..65537</a>

%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>

%F a(n) = Sum_{d|n} A008683(n/d) * A320107(d), where A008683 is Möbius mu-function.

%o (PARI)

%o A001227(n) = numdiv(n>>valuation(n, 2));

%o A064989(n) = {my(f); f = factor(n); if((n>1 && f[1,1]==2), f[1,2] = 0); for (i=1, #f~, f[i,1] = precprime(f[i,1]-1)); factorback(f)};

%o A252463(n) = if(!(n%2),n/2,A064989(n));

%o A320107(n) = A001227(A252463(n));

%o A320106(n) = sumdiv(n,d,moebius(n/d)*A320107(d));

%K nonn

%O 1

%A _Antti Karttunen_, Nov 22 2018