login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A328855 Number of factorizations of n into numbers with an odd number of distinct prime factors. 1

%I #8 Oct 28 2019 20:06:25

%S 1,1,1,2,1,1,1,3,2,1,1,2,1,1,1,5,1,2,1,2,1,1,1,3,2,1,3,2,1,2,1,7,1,1,

%T 1,4,1,1,1,3,1,2,1,2,2,1,1,5,2,2,1,2,1,3,1,3,1,1,1,4,1,1,2,11,1,2,1,2,

%U 1,2,1,6,1,1,2,2,1,2,1,5,5,1,1,4,1,1,1,3,1,4

%N Number of factorizations of n into numbers with an odd number of distinct prime factors.

%F Dirichlet g.f.: Product_{k>=1} 1 / (1 - A030230(k)^(-s)).

%e a(8) = 3 because 8 = 2 * 4 = 2 * 2 * 2.

%Y Cf. A001055, A030230, A050330, A328856.

%K nonn

%O 1,4

%A _Ilya Gutkovskiy_, Oct 28 2019

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)