[seqfan] Gregg Whisler's sequences A178793, A178794, A216467

[Neil Sloane]

Dear Seq Fans,
Gregg Whisler's sequence A216467 has been languishing at the bottom of the
"editing" stack for some time. It seems to be an interesting question in
number theory,
so I approved it. It is related to four other sequences, A157428, A157429,
A178793, A178794.

I marked A216467 as "conjectural", because I am not
sure how many of these terms are known to be correct. Could there be an
isolated
visible point with coordinates (19,66567788765), say, which would imply
that 19 is also in the sequence?
Should A178793, A178794 also be marked as conjectural?

Neil

Copy to Eric Rowland, who contributed a program to A178793, in case he is
not a member of this list

-- 
Dear Friends, I have now retired from AT&T. New coordinates:

Neil J. A. Sloane, President, OEIS Foundation
11 South Adelaide Avenue, Highland Park, NJ 08904, USA
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com