In each number, the transformation has the number of digits equal to the first digit. Each of the digits contained is then the rank of the following numbers.
i.e. 2461289=18 because the first digit is 2 (telling us there are 2 digits in the answer), the next digit is 4, showing that the first digit is the fourth of the original number (1), and the next number is the sixth digit of the original number (8)
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