Dense Egyptian Fractions

Details Dense Egyptian Fractions Dense Egyptian Fractions

1998-04-08

arxiv.org/abs/math/9804045v1

Trans. Amer. Math. Soc. 351 (1999), no. 9, pp. 3641-3657.

Mathematics

Number Theory

16 pages; to appear in Trans. Amer. Math. Soc

Scientific paper

Every positive rational number has representations as Egyptian fractions (sums of reciprocals of distinct positive integers) with arbitrarily many terms and with arbitrarily large denominators. However, such representations normally use a very sparse subset of the positive integers up to the largest demoninator. We show that for every positive rational there exist Egyptian fractions whose largest denominator is at most N and whose denominators form a positive proportion of the integers up to N, for sufficiently large N; furthermore, the proportion is within a small factor of best possible.

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