In 2014, Herzog, Kaplan and Lev introduced the critical numbers
cr(r,n) of natural intervals
[r,n] and determined the values of
cr(1,n) and
cr(2,n) for all
n , and for
r≥3, they determined the values of
cr(r,n) for
n≤(3r2+3r)/2 and
n≥(5r2+r)/2. In this note, we determine the remaining values of
cr(r,n) for
r≥3.
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