,
and with C. Mauduit we studied the distribution of 
-multiplicative functions in the
sequence 
, 
. We will survey these results and focus on the underlying estimates
of multilinear exponential sums.
With M. Drmota, we obtained very precise results on partial sums of digits of ,
and with C. Mauduit we studied the distribution of -multiplicative functions in the
sequence , . We will survey these results and focus on the underlying estimates
of multilinear exponential sums.
fond.