[seqfan] Re: A new and surprisingly hard elementary number theory question

[john.mason at lispa.it]

And apparently always increasing after a(8). That looks difficult to prove
too.
John

Inviato da iPad

> Il giorno 4 May 2017, alle ore 21:31, "Neil Sloane" <njasloane at gmail.com>
ha scritto:
>
> John, Good point!  I'll modify the sequence
> 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 Thu, May 4, 2017 at 2:46 PM,  <john.mason at lispa.it> wrote:
>>
>> Is it obvious that the sequence is infinite and/or without holes? Excuse
me
>> if this is an ingenuous question.
>> John
>>
>> Inviato da iPad
>>
>>>> Il giorno 4 May 2017, alle ore 19:50, "Giovanni Resta"
>>> <g.resta at iit.cnr.it> ha scritto:
>>>
>>> Il 04/05/2017 16:48, Jack Brennen wrote:
>>>
>>>> So it might be nice to know two things...  First, is 100,000,000
>>>> values of tau per CPU-minute a reasonable run rate?
>>> It is difficult to answer since the rate changes greatly depending on
>>> the magnitude of
>>> numbers and on the CPU.
>>> My C program on a single thread on a i7-3930K (thats doing nothing
else),
>>> in  neighborhood of 10^12  runs at about  1500*10^6 tau/min,
>>> and near 9*10^12  at about 800*10^6 tau/min.
>>> Using multiple threads these numbers become 6000*10^6 tau/m and
>>> and 3000*10^6 tau/m.
>>>
>>>> If so, where should one continue the search?
>>>
>>> If my search for the similar sequence A075046 is correct, I've already
>>> checked up to  10^13 (which is the limit of my program and also of my
>>> patience).
>>>
>>> Giovanni
>>>
>>>
>>> --
>>> Seqfan Mailing list - http://list.seqfan.eu/
>>
>>
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>
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