BULLETIN OF THE KOREAN MATHEMATICAL SOCIETY, cilt.58, sa.6, ss.1463-1481, 2021 (SCI-Expanded)
Divisibility properties of harmonic numbers by a prime number p have been a recurrent topic. However, finding the exact p-adic orders of them is not easy. Using class numbers of number fields and Bernoulli numbers, we compute the exact p-adic orders of harmonic type sums. Moreover, we obtain an asymptotic formula for generalized harmonic numbers whose p-adic orders are exactly one.