OFFSET
1,8
COMMENTS
Let S be a sequence of n 2's and 3's with curling number 2 and which has the form XY^2 with Y = 2. S is robust if no proper suffix of S^3 has curling number > 2.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 15 2012
STATUS
approved