[seqfan] Re: list of all non-prime coprimes of the full set of primorial numbers
Jamie Morken
jmorken at shaw.ca
Wed Apr 26 06:48:21 CEST 2017
Hi,
For the asymptotic growth, here is the count of coprimes of each Pn.Primorial coprimes
Pn(2)=6 2
Pn(3)=30 8=((5-1)*2)
Pn(4)=210 48=((7-1)*8)
Pn(5)=2310 480=((11-1)*48)Pn(6)=30030 5760=((13-1)*480)Pn(7)=510510 92160=((17-1)*5760)That can calculate the count of coprimes using the prime numbers - 1, ie Pn(7) has 92160 coprimes < 510510but doesn't show if the coprimes are duplicates and/or prime numbers. I guess the prime number contribution
could be subtracted out, so the only unknown would be the count of duplicate coprimes then. Thanks.cheers,Jamie----- Original Message -----
From: Charles Greathouse <charles.greathouse at case.edu>
To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
Sent: Tue, 25 Apr 2017 14:56:25 -0600 (MDT)
Subject: [seqfan] Re: list of all non-prime coprimes of the full set of primorial numbers
I think it would be reasonable to re-submit the clarified sequence.
Possible name: numbers n < P coprime to P for some primorial P. Question:
what is the asymptotic growth if this sequence? Clearly a(n) > kn for all k
and all large n.
On Fri, Apr 21, 2017 at 6:43 AM Jamie Morken <jmorken at shaw.ca> wrote:
> Hi,>The definition is not clear. Note that gcd(121,2310)=11, so why is
> >121 on the list?
> >Or, if 121 is on the list, why not 49?
>
> 121 is on the list as gcd(121,210)=1, the sequence includes all coprimes
> as long as they are coprime
> to at least one primorial x. 49 isn't on the list as I only included
> coprimes of primorials if they
> are smaller than the primorial. 49 isn't coprime to any primorial greater
> than Pn(3) = 30 so it isn't on
> the list.>Also, what is Pn? What is the difference between Pn(210) and 210
> ? >Did you mean to say >Pn(4) = 210 rather than Pn(210)? >Best regards
> >NeilYes thanks I meant to say Pn(4) = 210, where 210 is the fifth
> primorial, and Pn(0) = 1
> >Best regards
> >Neil
>
>
> reply to Franklin:
> >The full set of primorials is infinite, and only 1 is coprime to all of
> them. This is just the numbers coprime to 210, which is rather arbitrary.
>
> The values that are coprime to 210 also contains 253 which isn't in the
> list (see updated definition of coprimes smaller than Pn only included in
> the sequence).
>
> Should I resubmit the sequence if the definition is correct now? Thanks.
>
> cheers,
> Jamie
>
>
>
>
> --
> Seqfan Mailing list - http://list.seqfan.eu/
>
--
Charles Greathouse
Case Western Reserve University
--
Seqfan Mailing list - http://list.seqfan.eu/
More information about the SeqFan
mailing list