wärämäkä (65 [7776]), wi (66 [46656]). Some Niger-Congo languages have been reported to use a senary number system, usually in addition to another, such as decimal or vigesimal. Proto-Uralic has also been suspected to have had senary numerals, with a numeral for 7 being borrowed later, though evidence for constructing larger numerals (8 and 9) subtractively from ten suggests that this may not be so. Base 36 as senary compression For some purposes, senary might be too small a base for convenience. This can be worked around by using its square, base 36 (hexatrigesimal), as then conversion is facilitated by simply making the following replacements: Thus, the base-36 number WIKIPEDIA36 is equal to the senary number 5230323041222130146. In decimal, it is 91,730,738,691,298. The choice of 36 as a radix is convenient in that the digits can be represented using the Arabic numerals 0–9 and the Latin letters A–Z: this choice is the basis of the base36 encoding scheme. The compression effect of 36 being the square of 6 causes a lot of patterns and representations to be shorter in base 36: = 0.046 = 0.436 = 0.02136 = 0.2936 = 0.6 = 0.36 = 0.6 = 0.36 See also Diceware method to encode base-6 values into pronounceable passwords. Base36 encoding scheme ADFGVX cipher to encrypt text into a series of effectively senary digits References External links Shack's Base Six Dialectic Senary base conversion Website about Seximal Positional numeral systems Finger-counting de:Senär#Senäres Zahlensystem