A281529 a(n) = least denominator Y of any proper fraction X/Y which needs n or more terms to be written as a signed sum of distinct unit fractions.

2, 3, 7, 23, 163

Offset: 1

Author

Arkadiusz Wesolowski, Jan 23 2017

Keywords

• nonn
• frac
• hard
• more

References

• W. Sierpiński, O rozkładach liczb wymiernych na ułamki proste, PWN, Warsaw, Poland, 1957, pp. 96-100.

Crossrefs

Cf. A281527. See A281532 for numerators.