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In this note, we prove a congruence relation on real quadratic fields which relates class number and certain character sum. 本文证明了关于实二次域的类数和某类特征和的同余式，同时给出某类实二次域的类数可除性的一个判别法则。
Secondly, the performance of time-hopping sequences based on permutation-sequences, quadratic congruence sequences, cubic congruence sequences and hyperbolic congruence sequences are compared. 对置换跳时序列与二次同余跳时序列、三次同余跳时序列、双曲同余跳时序列进行了性能比较。