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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.
1
2, 3, 7, 23, 163
OFFSET
1,1
REFERENCES
W. Sierpiński, O rozkładach liczb wymiernych na ułamki proste, PWN, Warsaw, Poland, 1957, pp. 96-100.
CROSSREFS
Cf. A281527. See A281532 for numerators.
Sequence in context: A205827 A098544 A176706 * A090253 A001064 A108176
KEYWORD
nonn,frac,hard,more
AUTHOR
STATUS
approved