Restricted divisor sums
Broughan, K.A. (2002). Restricted divisor sums. Acta Arithmetica, 101(2), 105-114.
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There is a body of work in the literature on various restricted sums of the number of divisors of an integer function including that described in [2-9, 11] and summarised in Section 2 below.
Polska Akademia Nauk
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