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| 满足φ(n)|n-1的合数n(英文) | |
| 引用本文： | 单壿.满足φ(n)|n-1的合数n(英文)[J].中国科学技术大学学报,1985(1). |
| 作者姓名： | 单壿 |
| 作者单位： | 中国科学技术大学数学系 |
| 摘 要： | §1. Introduction In 1932, D. H. Lehmer asked if there are any composite integers n forwhich φ(n) |n-1, (φ)n being Euler's function. The answer to this question isstill not known. If S is any set of positive integers, denote by N (S,x) the number ofmembers of S which do not exceed x. Let a be an arbitrary integer, |
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