199917310179
199957410250
199935910137
200025902253
199960710304
199836610072
199904610305
199911310180
199957710108
199957510123
The above are numbers which the ending number is a check digit for the entire number (apart from the last digit obviously)
I want to know which check digit algorithm is used to calculate this checksum I used Luhn algorithm (1954), Verhoeff algorithm (1969) and the Damm algorithm (2004) with no luck, they create check digits but not the one already shown here
I am confident that these are valid number for the check digit, it's just that I don't know what the algorithm, can anyone help or give some pointers