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u(41⁵⁰)= u(70⁷¹)= u(5²⁹)= u(16¹⁶)= u(6²³)= u(9⁸⁰)= u(9³⁷)=
u(10²⁰+5⁴⁵+26¹⁷+4²⁰+9³⁰)=
u(4²¹+9³¹+5²²)=​