files giving extended versions of sequences

[Dean Hickerson]

> Franklin pointed out that we could use the "b000123.txt" files
> in cases where there are gaps in our knowledge.   That's an excellent
> idea.  But I'm not sure about the format in such cases.
>
> If the 17-th term is not known for certain, we might want to say
>
> 17  ?
> 17  NA
> 17  55?
> 17  55-60
>
> But would this mess up the plotting programs, or the convert-to-music
> programs?   Debbie, Russ, what do you think?

And what should be done if the sequence is defined as the set of numbers
satisfying some condition, and we don't know if the condition holds for
a particular number?  E.g. we might know that 1, 2, 3, and 5 are in the set,
but not know if 4 is.  So we don't know whether 5 is the 4-th or 5-th term.

Dean Hickerson
dean at math.ucdavis.edu