On the Equation a x ≡ x (mod b n )
On the Equation a x ≡ x (mod b n )
复制标题
关于方程 a x == x (mod b n )
DOI:
--
复制
发表时间:
2009
期刊:
影响因子:
--
通讯作者:
A. Yebra
中科院分区:
文献类型:
--
作者:
J. Urroz;J. Luis;A. Yebra
We study the solutions of the equation a x ≡ x(mod b n ). For some values of b, the solutions have a particularly rich structure. For example, for b = 10 we find that for every a that is not a multiple of 10 and for every n ≥ 2, the equation has just one solution xn(a). Moreover, the solutions for different values of n arise from a sequence x(a) = {xi}i�0, in the form xn(a) = P n 1 i=0 xi10 i . For instance, for a = 8 we obtain 8 56 ≡ 56 mod 10 2 � , 8 856 ≡ 856 mod 10 3 � , 8 5856 ≡ 5856 mod 10 4 � , . . . In this paper we prove these results and provide sufficient conditions for the base b to have analogous properties.