login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A328571 Primorial base expansion of n converted into its prime product form, but with all nonzero digits replaced by 1's: a(n) = A007947(A276086(n)). 7

%I

%S 1,2,3,6,3,6,5,10,15,30,15,30,5,10,15,30,15,30,5,10,15,30,15,30,5,10,

%T 15,30,15,30,7,14,21,42,21,42,35,70,105,210,105,210,35,70,105,210,105,

%U 210,35,70,105,210,105,210,35,70,105,210,105,210,7,14,21,42,21,42,35,70,105,210,105,210,35,70,105,210,105,210,35,70

%N Primorial base expansion of n converted into its prime product form, but with all nonzero digits replaced by 1's: a(n) = A007947(A276086(n)).

%H Antti Karttunen, <a href="/A328571/b328571.txt">Table of n, a(n) for n = 0..32768</a>

%H <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>

%F a(n) = A007947(A276086(n)).

%F a(n) = A276086(n) / A328572(n).

%F a(A276156(n)) = A276086(A276156(n)). [And at no other points the equality holds]

%F A001221(a(n)) = A267263(n).

%o (PARI) A328571(n) = { my(m=1, p=2); while(n, m *= (p^!!(n%p)); n = n\p; p = nextprime(1+p)); (m); };

%Y Cf. A001221, A007947, A267263, A276086, A328572.

%Y Cf. A276156 (gives the indices where this coincides with A276086).

%K nonn

%O 0,2

%A _Antti Karttunen_, Oct 20 2019

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 4 07:32 EDT 2020. Contains 333213 sequences. (Running on oeis4.)