Numeric output and dont echo repeating numbers for ex 1010101; 2020202, 1212121

Looking for a script that can pipe or print to file and generate a random, non repeating output wordlist/numberlist [crunch for example can do that with the -d option but 10101 etc dont get sorted out].

Example: a numeric list 000000-999999 and written to a file / pipe to program all numbers but no repeating sequences like 1010101; 2020202; 12121212, 13131313 ...... or repeating numbers 11 222 3333 44444 .....