On large primitive subsets of ${1,2,ldots,2n}$
On large primitive subsets of ${1,2,ldots,2n}$
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关于 ${1,2,ldots,2n}$ 的大原始子集
DOI:
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发表时间:
2018
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通讯作者:
S. Vijay
中科院分区:
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作者:
S. Vijay
A subset of ${1,2,ldots,2n}$ is said to be primitive if it does not contain any pair of elements $(u,v)$ such that $u$ is a divisor of $v$. Let $D(n)$ denote the number of primitive subsets of ${1,2,ldots,2n}$ with $n$ elements. Numerical evidence suggests that $D(n)$ is roughly $(1.32)^n$. We show that for sufficiently large $n$, $$(1.303...)^n < D(n) < (1.408...)^n$$