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A308415
Number of irreducible Egyptian fractions of denominator n which are the sum of 3 unit fractions.
3
3, 3, 5, 5, 8, 5, 10, 8, 11, 8, 13, 8, 15, 10, 13, 12, 18, 11, 19, 14, 19, 13, 22, 14, 22, 15, 22, 18, 24, 13, 25, 20, 23, 18, 28, 18, 25, 20, 28, 22, 28, 19, 29, 24, 29, 20, 33, 24, 35, 23, 32, 27, 33, 22, 42, 28, 35, 24, 38, 24, 30, 26, 38, 31
OFFSET
1,1
LINKS
Cyril Banderier, Florian Luca, Francesco Pappalardi, Numerators of Egyptian fractions, 2019.
EXAMPLE
There are a(2)=3 irreducible fractions with denominator n=2 which are the sums of 3 unit fractions: 1/2 = 1/8 + 1/8 + 1/4 and 3/2 = 1/2 + 1/2 + 1/2, and 5/2 = 1/1 + 1/1 + 1/2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Cyril Banderier, May 25 2019
STATUS
approved