Geodesic
On Some Divisibility Properties of (2n n)
Canadian mathematical bulletin, Tome 7 (1964) no. 4, pp. 513-518

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L. Moser [3] recently gave a very simple proof that 1 .has no solutions. In the present note we shall first of all prove that for , which by the fact that there is a prime p satisfying n < p ≤ 2n immediately implies that 2 .has no solutions. It is easy to see on the other hand that 3 .has infinitely many non-trivial solutions. 
Erdös, P. On Some Divisibility Properties of (2n n). Canadian mathematical bulletin, Tome 7 (1964) no. 4, pp. 513-518. doi: 10.4153/CMB-1964-047-5
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     title = {On {Some} {Divisibility} {Properties} of (2n n)},
     journal = {Canadian mathematical bulletin},
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