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Below a sequence of numbers is stated, I'm looking for the 7 missing natural numbers which should replace the 7 x's. Counting will give you information which can be neither positive nor negative.

02305230790701047230xxxxxxx

A hint to get you started:

"A number always starts with a 0, but a 0 isn't always the start of a number."

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The rule is:

23 is the 9th prime number.
523 is the 99th prime number.
7907 is the 999th prime number.
104723 is the 9999th prime number.

The missing 7 digits are:

1299689, the 99999th prime number.

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