Note that a potential 7th term (1/64) was rounded-off and thrown way.
After 2050 BCE an exact numeration system discontinued the rounded-off Old Kingdom binary system. An exact hieratic weights and measures system reported rational numbers in 1/64 quotient and 1/320 remainder units whenever possible.
The new Middle Kingdom math system "healed" rounded off binary series by several finite methods. Two weights and measures finite systems can be reported by:
1. 1 hekat (a volume unit) used a unity (64/64)such that (32 + 16 + 8 + 4 + 2 + 1/64)hekat+ 5 ro