A sequence of positive integers is called an iteration sequence if there exists a strictly increasing sequence of positive integers such that and for , 3, .... A necessary and sufficient condition for to be an iteration sequence is
for all .
A sequence of positive integers is called an iteration sequence if there exists a strictly increasing sequence of positive integers such that and for , 3, .... A necessary and sufficient condition for to be an iteration sequence is
for all .
Weisstein, Eric W. "Iteration Sequence." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/IterationSequence.html