OFFSET
1,2
COMMENTS
It is conjectured that a(n) <= 5.
EXAMPLE
a(6) = 1 because 6 is already nonprime squarefree number.
a(7) = 2 because 7 = 6 + 1 is a partition of 7 into 2 nonprime squarefree parts and there is no such partition with fewer terms.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jul 29 2017
STATUS
approved