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”).

Moebius transform of n!.
3

%I #16 Sep 16 2021 14:08:16

%S 1,1,5,22,119,713,5039,40296,362874,3628679,39916799,479000858,

%T 6227020799,87178286159,1307674367875,20922789847680,355687428095999,

%U 6402373705364406,121645100408831999,2432902008173011178

%N Moebius transform of n!.

%C n=5, f[5]=120, divisors={1,5} f[5/d]={120,1}, mu[d]={1,-1}, the sum is 120-1=119=a(5)

%H Seiichi Manyama, <a href="/A062794/b062794.txt">Table of n, a(n) for n = 1..449</a>

%F a(n) = Sum{f[n/d]*mu[d]}, where d|n and f[x]=A000142(x).

%F a(n) ~ n!. - _Vaclav Kotesovec_, Sep 16 2021

%o (PARI) a(n) = sumdiv(n, d, d!*moebius(n/d)); \\ _Michel Marcus_, Nov 04 2018

%Y Cf. A000142, A008683.

%K nonn

%O 1,3

%A _Labos Elemer_, Jul 19 2001