Geodesic
On the Number of Binomial Coefficients which are Divisible by their Row Number
Canadian mathematical bulletin, Tome 25 (1982) no. 3, pp. 363-365

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If n is a natural number, let A(n) be the number of integers, k, such that 0 < k < n and n divides . Then φ(n) ≤ A(n) ≤ n - 1 - 2ω(n) + ɛ, where ?(n) denotes the number of distinct prime factors of n, and ɛ = 0 unless n is twice a prime, in which case ɛ = 1.
DOI : 10.4153/CMB-1982-052-3
Mots-clés : 10A99 
Robbins, Neville. On the Number of Binomial Coefficients which are Divisible by their Row Number. Canadian mathematical bulletin, Tome 25 (1982) no. 3, pp. 363-365. doi: 10.4153/CMB-1982-052-3
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     title = {On the {Number} of {Binomial} {Coefficients} which are {Divisible} by their {Row} {Number}},
     journal = {Canadian mathematical bulletin},
     pages = {363--365},
     year = {1982},
     volume = {25},
     number = {3},
     doi = {10.4153/CMB-1982-052-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1982-052-3/}
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