1 >> # Three digits in, 2/6 digits out, rounding down.
21 >> # One digit in. Must not produce spurious digits or trailing nulls.
44 >> # Three digits in, 2/6 digits out, rounding up.
61 >> # Three digits in, 1/6 digits out, rounding down.
82 >> # One digit in. Must not produce trailing nulls.
105 >> # Three digits in, 1/6 digits out, rounding up.