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!)
A319567 Product of y divided by the GCD of y to the power of the length of y, where y is the integer partition with Heinz number n. 7

%I #11 Nov 09 2018 21:44:09

%S 1,1,1,1,1,2,1,1,1,3,1,2,1,4,6,1,1,4,1,3,2,5,1,2,1,6,1,4,1,6,1,1,10,7,

%T 12,4,1,8,3,3,1,8,1,5,12,9,1,2,1,9,14,6,1,8,15,4,4,10,1,6,1,11,2,1,2,

%U 10,1,7,18,12,1,4,1,12,18,8,20,12,1,3,1,13

%N Product of y divided by the GCD of y to the power of the length of y, where y is the integer partition with Heinz number n.

%C The Heinz number of a partition (y_1, ..., y_k) is prime(y_1) * ... * prime(y_k).

%F a(n) = A003963(n) / A289508(n) ^ A001222(n).

%t primeMS[n_]:=If[n==1,{},Flatten[Cases[FactorInteger[n],{p_,k_}:>Table[PrimePi[p],{k}]]]];

%t Table[If[n==1,1,Times@@primeMS[n]/GCD@@primeMS[n]^PrimeOmega[n]],{n,100}]

%Y Cf. A003963, A001222, A056239, A067538, A112798, A143773, A289508, A289509, A316430.

%K nonn

%O 0,6

%A _Gus Wiseman_, Sep 23 2018

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 August 1 11:59 EDT 2024. Contains 374817 sequences. (Running on oeis4.)