[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
which starts with an email (from me!) from six years ago which is quite
similar to yours.

Charles Greathouse
Case Western Reserve University

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

> 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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