OFFSET
1,2
COMMENTS
Sierpiński conjectured that for any integer n > 3 there exist positive integers a, b, c so that 5/n = 1/a + 1/b + 1/c. If the conjecture is true, then 5 appears only once in the sequence.
REFERENCES
W. Sierpiński, O rozkładach liczb wymiernych na ułamki proste, PWN, Warsaw, Poland, 1957, pp. 96-100.
CROSSREFS
KEYWORD
nonn,frac,hard,more
AUTHOR
Arkadiusz Wesolowski, Jan 23 2017
STATUS
approved