OFFSET
0,6
EXAMPLE
a(10) = 10 because we have [8, 2], [7, 3], [5, 3, 2], [5, 2, 3], [3, 7], [3, 5, 2], [3, 2, 5], [2, 8], [2, 5, 3] and [2, 3, 5].
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jan 29 2020
STATUS
approved