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dnd_ndn is the last nonzero digit of the decimal representation of n!n!n!.
Is dnd_ndn eventually periodic?
Clarification: dnd_ndn is called "eventually periodic" if there exist kkk and n0n_0n0 such that dn+k=dnd_{n+k}=d_ndn+k=dn for all n≥n0.n\geq n_0.n≥n0.
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