OFFSET
1,2
COMMENTS
The union of the half-open intervals [a(2i-1),a(2i)) is the greedy set of real numbers at least 1 that does not contain any subset of the form {a, ar, ar^2, ar^3, ar^4, ar^5} with r an integer.
LINKS
M. B. Nathanson, K. O'Bryant, A problem of Rankin on sets without geometric progressions, arXiv preprint arXiv:1408.2880, 2014
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Kevin O'Bryant, Jan 03 2014
STATUS
approved