[seqfan] Re: A hypothetical sequence
Charles Greathouse
charles.greathouse at case.edu
Wed Sep 7 21:36:43 CEST 2011
Certainly there are sequences with entirely conjectural terms (e.g.,
A135733) but they are, in general, to be avoided. Three terms sounds
doable, as Alonso suggests. (Certainly there's more glory that way!)
Charles Greathouse
Analyst/Programmer
Case Western Reserve University
On Wed, Sep 7, 2011 at 3:22 PM, Alonso Del Arte
<alonso.delarte at gmail.com> wrote:
> What I would suggest doing is this: see if you can at confirm 19 and 41 are
> terms. "3, 19" gives hundreds of results. "3, 19, 41" gives just five, which
> is tolerable, in my opinion.
>
> Al
>
> On Wed, Sep 7, 2011 at 9:31 AM, Vladimir Shevelev <shevelev at bgu.ac.il>wrote:
>
>> In 1969, D.J.Newman proved that in the race of odious multiples of 3
>> versus evil multiples of 3 the latter permanently win from the very outset
>> (sequences of odious and evil numbers are A000069, A001969).
>> Denote by V_p the sequence of positive integers with the smallest prime
>> divisor p. Note that the Newman result is true for V_3. For p>3, I proved
>> (2008) that, for sufficiently large n (n>n_p), the race of odious numbers
>> from V_p versus evil multiples from V_p the latter lose. A very
>> interesting question: does there exist a prime p>3, for which they
>> permanently not win from the very outset?
>> Unfortunately, n_p can be very large and I have no an upper estimate for
>> it. Nevertheless, I conjecture that the question is answered in affirmative.
>> Moreover, I conjecture that the first such a prime is 11. With help of some
>> numerical observations I did conjectures that in this series there are also
>> 19, 41, 67, 107, 173, 179, 181, 307, 313, 421, 431, 433, 587, 601, 631, 641,
>> 647, 727, 787. Up to 1000, I did not find other such primes. I wonder if a
>> sequence with only hypothetical terms can be submitted to OEIS? Can anyone
>> verify and, maybe, remove any term?
>>
>> Best regards,
>> Vladimir
>>
>>
>> Shevelev Vladimir
>>
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