[seqfan] Re: signed sequences without %V in internal format

Charles Greathouse charles.greathouse at case.edu
Wed Mar 16 05:17:55 CET 2016


The general policy is now that a sequence with negative terms should have
keyword:sign even if no negative terms appear in the given terms. See the
discussion pointed to by
https://oeis.org/wiki/User:Charles_R_Greathouse_IV/Keywords
which starts with an email (from me!) from six years ago which is quite
similar to yours.

Charles Greathouse
Analyst/Programmer
Case Western Reserve University

On Tue, Mar 15, 2016 at 9:59 AM, Moritz Firsching <moritz at math.fu-berlin.de>
wrote:

> Dear Seq fans,
>
>  since I am new to this mailing list, this might have come up already.
> Is there a way to search the archive of this mailing list?
>
> I have noticed that there are many (in fact 180, see list attached
> below) sequences that have the keyword "sign", but the internal format
> does not contain lines for %V (nor %W and %X). Is this the intended
> behavior?
>
>
> From reading https://oeis.org/eishelp1.html I didn't quite understand
> the policy on sequences that eventually have negative values but none of
> the first terms are negative, e.g. https://oeis.org/A005444 .
> They should have the label "sign", right?
> Shouldn't they also have the lines %V, %W, %X in their internal format?
> The sequence A005444 hasn't:
> https://oeis.org/search?q=id:A005444&fmt=text
>
> If I understand correctly: if a sequence contains both the keyword
> "sign" and doesn't have a values for "%V", then either
>
>  - a line for %V should be added, if the sequence realy is signed (e.g.
>  A005444 ) or
>
>  - the sign keyword should be removed, otherwise (e.g. A182262 )
>
>
>
>
>
> I have another question, just to understand better how the internal
> format for signed sequences works:
>
> On the help page https://oeis.org/eishelp1.html, there is an example
> given with signs: https://oeis.org/A000594 .
> If you click on "internal format" you get to the page
> https://oeis.org/A000594/internal . Here the lines %S, %T, %U are
> signed. (This makes it a bit hard to understand the help page...)
> But if one accesses the internal format via
> https://oeis.org/search?q=id:A000594&fmt=text
> we get the lines %V, %W, %X as predicted.
> I suspect that clicking the "internal format" link, the lines %S, %T, %U
> are filled with the values in %V, %W, %X and those are not displayed in
> the case of a signed sequence. Is this observation correct?
>
>
>
> Best wishes
>  Moritz
>
> A005444, A006729, A006730, A006742, A006809, A009196, A009268, A009542,
> A012162, A012262, A012610, A012769, A012804, A012821, A013091, A013517,
> A014590, A014646, A014856, A014922, A014988, A015076, A015088, A015120,
> A015142, A015166, A015186, A015208, A015252, A015270, A015322, A015348,
> A015400, A015406, A015420, A015426, A015450, A015478, A015516, A015522,
> A015538, A015582, A015586, A015648, A015658, A015660, A015670, A015700,
> A015712, A015726, A015736, A015760, A015790, A015802, A015816, A015828,
> A015846, A015852, A015862, A015868, A015912, A015918, A015928, A015930,
> A015946, A015966, A015972, A015978, A016000, A016042, A016050, A016056,
> A016080, A016110, A016128, A016132, A016156, A016168, A016180, A016236,
> A016240, A016258, A033809, A033885, A034415, A034598, A038698, A040076,
> A046067, A046068, A052435, A055458, A056598, A056599, A056601, A057192,
> A057427, A057752, A059571, A061053, A062825, A066520, A067857, A072203,
> A083453, A086144, A088819, A091174, A091750, A091751, A091758, A092243,
> A097563, A102261, A103222, A110857, A112632, A118480, A118804, A120545,
> A120546, A120547, A120548, A120549, A120550, A120551, A120552, A120554,
> A120555, A120559, A121573, A130119, A133097, A137419, A139367, A139368,
> A154752, A157809, A157812, A157827, A157920, A157930, A157945, A157946,
> A157965, A158063, A158211, A158216, A158505, A158516, A158530, A158531,
> A158532, A158635, A158819, A158925, A161808, A161905, A165510, A165511,
> A165597, A168140, A169757, A174695, A175150, A178957, A179230, A179405,
> A181873, A182101, A182262, A182399, A183065, A184005, A185289, A189981,
> A194591, A194606, A194636, A199480
>
>
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>


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