[seqfan] Re: list of all non-prime coprimes of the full set of primorial numbers
njasloane at gmail.com
Thu Apr 20 15:56:55 CEST 2017
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?
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)?
Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com
On Thu, Apr 20, 2017 at 7:14 AM, Jamie Morken <jmorken at shaw.ca> wrote:
> Here is a sequence I added as a draft: https://oeis.org/draft/A285510
> It is a list of all non-prime coprimes of the full set of primorial numbers.
> b-file: https://oeis.org/draft/A285510/b285510.txt
> Pn(2) has 1 coprime: 1
> Pn(6) has 2 coprimes: 1,5
> Pn(30) has 8 coprimes: 1,7,11,13,17,19,23,29
> Pn(210) has 48 coprimes: etc..
> The sequence is a complete list of all non-prime coprimes for all Pn. The sequence starts:
> Only large n values in the sequence will change when larger Pn are added to the set, values up to an increasingly
> large n will not change as larger Pn are added.
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