The paper asserts divisibility properties of Catalan numbers, including 6 | sigma(C_n) for n > 6, but the central proof is invalid and the asymptotics are arithmetically wrong.
Erd¨ osOn some divisibility properties of ( 2n n )
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Notes on Divisibility of Catalan Numbers
The paper asserts divisibility properties of Catalan numbers, including 6 | sigma(C_n) for n > 6, but the central proof is invalid and the asymptotics are arithmetically wrong.