[math-fun] Re: A ternary notation

If you use 2 to represent the -1 digit, you will get: 0, 1, 12, 10, 11, 122, 120, 121, 102, 100, 101, ...

... This could be used to represent the natural numbers with primes instead of powers of 3: 2 3 5 7 11 13 17 19 23 ... 0=0 => 0 1= 2 1 => 21 2= 1 => 1 3= 0 1 => 10 4= 1 2 1 => 121 5= 1 1 => 11 6= 2 1 1 => 112 7= 1 0 1 => 101 8= 0 1 1 => 110 9= 1 0 0 1 => 1001 10= 1 1 1 => 111 11= 1 2 1 1 => 1121 12= 2 0 1 1 => 1102 etc. best, and thanks to all contributors, É.