On Mon, Nov 15, 2010 at 4:14 AM, Joerg Arndt <arndt at jjj.de> wrote: > What does it mean? > It is not in the doc at > http://oeis.org/eishelp2.html#RK It is a pseudo-keyword assignable only by the server itself and means that the sequence was formerly allocated but is back in the pool of numbers that can be used for new sequences. Russ