Sentence:  We have as variations for the numbers from 6 to 9, 6 = "X" + 1…, 7 = "X" + 2, etc.,…the numerals of the second <WSD>quintate</WSD> repeating without the use of the expressed base "five". 
Meaning of the word marked with <WSD> tags:  -(decimal) number system The (set) of the (series) of (integers) that occur between a (multiple) of (five) and the next ((exclusive) of those multiples).