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arXiv 0811.4769math.NT
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等差数列最小公倍数下界的进一步改进

Further Improvements of Lower Bounds for the Least Common Multiples of Arithmetic Progressions

Shaofang Hong, Scott D. Kominers

摘要:

对于互素正整数u_0和r,考虑等差数列{u_k:= u_0+k*r}(0 <= k <= n).定义L_n:= lcm{u_0,u_1,.,u_n},且a >= 2为任意整数。本文证明了:对于整数α,r >= a和n >= 2*alpha*r,有L_n >= u_0*r^{alpha+a-2}*(r+1)^n.特别地,令a = 2产生对L_n上的最佳先前下界(由Hong和Yang获得)的改进,除了三个α的选择,r >= 2。

英文摘要:

For relatively prime positive integers u_0 and r, we consider the arithmetic progression {u_k := u_0+k*r} (0 <= k <= n). Define L_n := lcm{u_0,u_1,...,u_n} and let a >= 2 be any integer. In this paper, we show that, for integers alpha,r >= a and n >= 2*alpha*r, we have L_n >= u_0*r^{alpha+a-2}*(r+1)^n. In particular, letting a = 2 yields an improvement to the best previous lower bound on L_n (obtained by Hong and Yang) for all but three choices of alpha,r >= 2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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