OFFSET
1,4
COMMENTS
No multiple of 3 appears, so a(3n) = 0 for all n.
FORMULA
a(n) <= (2/3)*n + 15 for n > 6.
EXAMPLE
a(5) = 3, since in A321350, 2 --> (2+3)^2 --> 5, so 5 first appears in the third row.
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Jeremy F. Alm, Nov 06 2018
STATUS
approved