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

john.mason at lispa.it john.mason at lispa.it
Thu May 4 20:46:56 CEST 2017

Is it obvious that the sequence is infinite and/or without holes? Excuse me
if this is an ingenuous question.

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
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