We present here a large collection of harmonic and quadratic harmonic sums, that can be useful in applied questions, e.g., probabilistic ones. We find closed-form formulae, that we were not able to locate in the literature.

翻译：本文汇集了大量调和和与二次调和和，这些结果在应用问题（例如概率论问题）中可能具有实用价值。我们发现了文献中未曾记载的封闭形式计算公式。