[seqfan] Re: Composite numbers n such that digits of prime factors of n are either 4 or 9.

[israel at math.ubc.ca]

More generally, for every list S of primes we could have a sequence for
"Composite numbers whose prime factors are in S".  There are lots of those!

Cheers,
Robert


On Sep 22 2020, Neil Sloane wrote:

>D Corneth said:
>
>There's no wiki for that family (right?). Do I add the 24
>sequences as an xref or would we (an expert on that) make a new
>wikipage for it?
>
>Me:  The best thing: make an entry for this in the OEIS Index, and add
>links to the Index entry from each of the sequences
>
>I don't think we need yet another wiki page
>
>
>Best regards
>Neil
>
>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 Tue, Sep 22, 2020 at 11:19 AM David Corneth <davidacorneth at gmail.com>
>wrote:
>
>> I'm now editing "Composite numbers n such that digits of prime factors 
>> of n are either 4 or 9." (A036319) which is a member of a family of at 
>> least 24 sequences. There's no wiki for that family (right?). Do I add 
>> the 24 sequences as an xref or would we (an expert on that) make a new 
>> wikipage for it?
>>
>> Best,
>> David
>>
>> --
>> Seqfan Mailing list - http://list.seqfan.eu/
>>
>
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>