Singmaster, D. «Research Problems: How often does an integer occur as a binomial coefficient?». American Mathematical Monthly, 78, 4, 1971. DOI: 10.2307/2316907. JSTOR: 2316907.
Abbott, H. L.; Erdős, P.; Hanson, D. «On the number of times an integer occurs as a binomial coefficient». American Mathematical Monthly, 81, 3, 1974, pàg. 256–261. DOI: 10.2307/2319526. JSTOR: 2319526.
jstor.org
Singmaster, D. «Research Problems: How often does an integer occur as a binomial coefficient?». American Mathematical Monthly, 78, 4, 1971. DOI: 10.2307/2316907. JSTOR: 2316907.
Abbott, H. L.; Erdős, P.; Hanson, D. «On the number of times an integer occurs as a binomial coefficient». American Mathematical Monthly, 81, 3, 1974, pàg. 256–261. DOI: 10.2307/2319526. JSTOR: 2319526.
