[seqfan] Re: searching on oeis.org for sequences with partial information

[Peter Munn]

It occurs to me that a new OEIS search option that would help here is
results sorting by _data_. Would this be a big job? It would be far more
widely accessible than custom processing of stripped.gz. I would
frequently find such an option helpful in cases where I get many results,
but only a few match at the start of the sequence (since these matches
would be clustered in the list).

Best regards,

Peter

On Tue, February 16, 2021 8:39 pm, Charles Greathouse wrote:
> For the original question, I don't know of better approaches than (1)
> using
> stripped.gz to restrict matches to the beginning, optionally skipping the
> first term, and (2) finding relationships manually (dividing out factors,
> etc.).
>
> With the first three terms I wouldn't have found anything, but with the
> fourth I found
> A203478(n) = A028362(n+1) * 2^(n*(n-1)/2)
> which may be relevant to you.
>
> On Thu, Feb 11, 2021 at 1:28 AM andre maute <andre.maute at gmx.de> wrote:
>> FYI, i have now the fourth term of this sequence
[...]
>>
>> On 2/9/21 9:30 PM, andre maute wrote:
>> > Hello list,
>> >
>> > I have sometimes the following problem when doing some type of
>> enumeration.
>> > I wonder if there is already a feature on oeis.org which would help
>> here.
>> >
>> > Suppose you have written a program generating
>> > a sequence A(n), which does some intermediate (debug) output.
>> >
>> > The computation of the A(n) gets slower and slower with the next n,
>> > but due to the availability of the intermediate output it is possible
>> > to extract perhaps some lower bound for a particular A(n).
>> >
>> > So you have e.g.
>> > A(1) = 1, A(2) = 3, A(3) = 30, A(4) > 500
>> >
>> > Would it possible to use this information, for an oeis.org search?
>> >
>> > For this sequence I would like to enter:
>> > "1, 3, 30, >500"