[seqfan] Re: A073615

Neil Sloane njasloane at gmail.com
Wed Feb 5 19:59:21 CET 2014


OK, I've edited A073615 so the definition matches the terms,
and there is a new entry A236411 with Don's terms.

The former could use some more terms (probably from a trivial
modification of your program, Don?) and the latter could use
a Mma or other program.

Neil


On Wed, Feb 5, 2014 at 12:35 PM, Neil Sloane <njasloane at gmail.com> wrote:

> Harvey, Tony, Thanks for those comments.
> So the present definition does not match the Comments
> nor the Mma program.
>
> OK, we will have two sequences. I will do
> the editing.
>
> Neil
>
>
> On Wed, Feb 5, 2014 at 12:21 PM, Harvey P. Dale <hpd at hpdale.org> wrote:
>
>> Neil:
>>         I'm not sure that 37 works for a(5).  a(5) starts with the 6th
>> prime (because the first prime, 2, has been discarded per the comments)
>> which is 13.  To get 5 differences (as required for the 6th prime) we need
>> the differences for {13, 17, 19, 23, 29, 31} which are {4, 2, 4, 6, 2}.  To
>> get 5 differences for primes starting with 37 we need the differences for
>> {37, 41, 43, 47, 53, 59} which are {4, 2, 4, 6, 6}.  That does not match.
>>  If, however, we start with 223 we need the differences for {223, 227, 229,
>> 233, 239, 241} which are {4, 2, 4, 6, 2}.  That does match.
>>         Have I misunderstood something?
>>         Best,
>>         Harvey
>>
>> From: Neil Sloane [mailto:njasloane at gmail.com]
>> Sent: Wednesday, February 5, 2014 11:53 AM
>> To: Sequence Fanatics Discussion list
>> Cc: Robert G. Wilson v; Harvey Dale
>> Subject: Re: [seqfan] A073615
>>
>> Don, I agree that 37 seems to work for a(5).
>>
>> I will make the corrections.
>>
>> But the Mathematica program definitely gives 223.
>> Can some Mma expert explain why?
>>
>> Bob? Harvey?
>>
>> Thanks
>>
>> Neil
>>
>> On Wed, Feb 5, 2014 at 8:04 AM, Don Reble <djr at nk.ca> wrote:
>> Seqfans:
>>
>>    I dispute A073615(5): 37, not 223. More terms:
>>
>>    5,11,13,101,37,1277,1279,1616603,57405419,51448351,76623356077,
>>    115438255651991,433241801791933
>> %C a(9) > 1734338611, a(10) = 51448351, a(11) > 131045797.
>>
>>    No, yes, yes.
>>
>> --
>> Don Reble  djr at nk.ca
>>
>>
>> --
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>>
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>> --
>> Dear Friends, I have now retired from AT&T. New coordinates:
>>
>> 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
>>
>>
>
>
> --
> Dear Friends, I have now retired from AT&T. New coordinates:
>
> 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
>
>


-- 
Dear Friends, I have now retired from AT&T. New coordinates:

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


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