Find the pattern between numbers

Максим
3

Максим

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Project title: Find the pattern between numbers
Type of cooperation: One-time project
Section: Other / Miscellaneous
Prepayment: without prepayment
Payment methods: Bank transfer, Electronic money
Acceptance of requests: closed

Project description:
Dano:
2 rows of numbers
x --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
352921050910885 617040243
352921051251529 617612100
353887050135683 716342643
35489705275690619157327
356966055365839 ????
The number "x" passes through an unknown algorithm and we get the number "y" .

The objective is to find a pattern, i.e. The algorithm by which the "run" is "run" the number "x" to obtain the number "y" (if possible at all)

Details:
There are 4 bundles of x->y numbers known at the moment, but to test your algorithm.
- "x" - 15-digit number, "y" - 9-digit number
The payment is minimal, I will listen to your suggestions.
Project author
Максим