A factorial problem
Number Theory
Level
2
\(d_n\) is the last nonzero digit of the decimal representation of \(n!\).
Is \(d_n\) eventually periodic?
Clarification: \(d_n\) is called "eventually periodic" if there exist \(k\) and \(n_0\) such that \(d_{n+k}=d_n\) for all \(n\geq n_0.\)
by
Freddie Hand