OFFSET
1,4
COMMENTS
Question: what is the maximum value possible for (a(n) - n)? The current record is 5, which occurs at n=31.
There is no maximum. We can take k copies of the 17-mine configuration and place them sufficiently far apart to get 18k fours. So a(17k) - 17k >= 18k - 17k = k can get arbitrarily large. A possibly more interesting question is to ask about the maximum ratio a(n)/n. - Yevhenii Diomidov, Jan 19 2022
LINKS
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Dmitry Kamenetsky, Apr 16 2018
STATUS
approved