[seqfan] Re: Problem reproducing A019989, A019990, and A019991

[Fred Lunnon]

   Note author is Bill Gosper!    WFL



On 4/13/19, Sean A. Irvine <sairvin at gmail.com> wrote:
> The sequences A019989, A019990, and A019991 partition the integers into
> three disjoint sets.
>
>  I tried to implement these sequences as described, but all the functions
> a, b, c, A, B, C quickly become fixed on true.  From the actual values, it
> would appear that exactly one of a, b, c, should be true at each even
> iteration, so I think there must be either something missing from or
> incorrect in the description.
>
> I tried using XOR on place of OR, and various other possibilities, but was
> unable to reproduce the values of the sequences.
>
> Ideas?
>
> Sean.
>
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