Geodesic
On a Theorem of Niven
Canadian mathematical bulletin, Tome 22 (1979) no. 1, pp. 113-115

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In [4], Niven proved that the set A of integers for all s ≥ l and all n ≥ 1 has density zero, being the sum of the sth powers of all positive divisors of n. However his argument contains a mistake (see Remark 1). In this paper we give a proof of Niven's result and establish several related results, one of which generalizes a result of Dressier (See Theorem 3 and Remark 2). 
Rao, R. Sita Rama Chandra; Murty, G. Sri Rama Chandra. On a Theorem of Niven. Canadian mathematical bulletin, Tome 22 (1979) no. 1, pp. 113-115. doi: 10.4153/CMB-1979-018-5
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