OFFSET
1,5
COMMENTS
The next term is a(7) > 467871307.
LINKS
R. Arce-Nazario, F. Castro, and R. Figueroa, On the number of solutions of Sum_{i = 1..11} 1/x_i = 1 in distinct odd natural numbers, J. Number Theory, 133 (2013), 2036-2046.
EXAMPLE
If 1 < x_1 < x_2 < x_3 are odd, then 1/x_1 + 1/x_2 + 1/x_3 < 3/3 = 1, so a(2) = 0.
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
Jonathan Sondow, Apr 21 2014
STATUS
approved