Geodesic
On The Number of Binomial Coefficients Which are Divisible by Their Row Number: II
Canadian mathematical bulletin, Tome 28 (1985) no. 4, pp. 481-486

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If n is a natural number, let A(n) denote the number of integers, k, such that 0 < k < n and n divides . Let φ(n) denote Euler's totient function. Necessary and sufficient conditions are given so that A(n) = φ(n) when n is square-free.
DOI : 10.4153/CMB-1985-059-0
Mots-clés : 10A99 
Robbins, Neville. On The Number of Binomial Coefficients Which are Divisible by Their Row Number: II. Canadian mathematical bulletin, Tome 28 (1985) no. 4, pp. 481-486. doi: 10.4153/CMB-1985-059-0
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     author = {Robbins, Neville},
     title = {On {The} {Number} of {Binomial} {Coefficients} {Which} are {Divisible} by {Their} {Row} {Number:} {II}},
     journal = {Canadian mathematical bulletin},
     pages = {481--486},
     year = {1985},
     volume = {28},
     number = {4},
     doi = {10.4153/CMB-1985-059-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1985-059-0/}
}
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