A240132 Number of solutions of 1/x_1 + 1/x_2 + ... + 1/x_{2n-1} = 1 in distinct odd numbers > 1.

0, 0, 0, 0, 5, 379118

Offset: 1

Author

Jonathan Sondow, Apr 21 2014

Keywords

• hard
• more
• nonn

Comments

The next term is a(7) > 467871307.

Examples

			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.
		

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.
• C. Elsholtz, Review of ``On the number of solutions of sum_{i = 1..11} 1/x_i = 1 in distinct odd natural numbers'' by R. Arce-Nazario, F. Castro, and R. Figueroa, zbMATH 1270.11033.

Crossrefs

The five sets of 9 odd numbers are: A201644, A201646, A201647, A201648, A201649.

See A238795 and A239036 for specific sets of 11 odd numbers.