Divisibility by 2 and 3 of certain Stirling numbers

Details Divisibility by 2 and 3 of certain Stirling numbers Divisibility by 2 and 3 of certain Stirling numbers

2008-07-16

arxiv.org/abs/0807.2629v1

Mathematics

Number Theory

35 pages, submitted

Scientific paper

The numbers e_p(k,n) defined as min(nu_p(S(k,j)j!): j >= n) appear frequently in algebraic topology. Here S(k,j) is the Stirling number of the second kind, and nu_p(-) the exponent of p. The author and Sun proved that if L is sufficiently large, then e_p((p-1)p^L + n -1, n) >= n-1+nu_p([n/p]!). In this paper, we determine the set of integers n for which equality holds in this inequality when p=2 and 3. The condition is roughly that, in the base-p expansion of n, the sum of two consecutive digits must always be less than p.

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