Prime divisors of shifted factorials

被引:4
|
作者
Luca, F [1 ]
Shparlinski, IE
机构
[1] Univ Nacl Autonoma Mexico, Inst Matemat, Morelia 58089, Michoacan, Mexico
[2] Macquarie Univ, Dept Comp, Sydney, NSW 2109, Australia
基金
澳大利亚研究理事会;
关键词
D O I
10.1112/S0024609305004923
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
For any positive integer n we let P(n) be the largest prime factor of n. We improve and generalize several results of P. Erdos and C. Stewart on P(n! + 1). In particular, we show that lim sup(n ->infinity) P(n! + 1)/n >= 2.5, which improves their lower bound of lim sup(n ->infinity) P(n! + 1)/n > 2.
引用
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页码:809 / 817
页数:9
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