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arXiv 0812.3089math.NTmath.CO
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Binomial coefficients and the ring of p-adic integers

Zhi-Wei Sun, Wei Zhang

英文摘要:

Let k>1 be an integer and let p be a prime. We show that if $p^a\le k<2p^a$ or $k=p^aq+1$ (with 2q<p) for some a=1,2,..., then the set {\binom{n}{k}: n=0,1,2,...} is dense in the ring Z_p of p-adic integers, i.e., it contains a complete system of residues modulo any power of p.

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