Dear seqfans,
The values of n between 0 and 1000 for which
sum(mobius(binom(n,k),k=0..n))=0
are
3,12,24,29,34,40 (not yet in OEIS).
For example mobius(1)+mobius(3)+mobius(3)+mobius(1)=1-1-1+1=0.
Is this a finite sequence?
Thanks.
Emeric
P.S. Sorry, in previous message I forgot about the subject line.