(dotimes (i 256)
  (let ((ht (aref hash-tables i)))
    (dotimes (j 16)
      (unless (eq (/= 0 (logand (lsh 1 j) i))
                  (gethash (lsh 1 j) ht))
        (error "hash table corruption at table %S, bit %S" i j)))))

(aref hash-tables 17)
;; #s(hash-table size 3 test eq rehash-size 1.5 rehash-threshold 0.8125 purecopy t data (1 t 0 t 16 t))

(gethash 1 (aref hash-tables 17))
;; nil