Find the pattern between numbers

Employer
[no-member:pro]Maksim[/no-member:pro]Maksim
Project parameters
Type of cooperationOne-time project
SectionOther / Miscellaneous
Prepaymentwithout prepayment
Payment methodsBank transfer, Electronic money
Acceptance of requestsclosed
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.
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.