OFFSET
1,1
COMMENTS
Primitive means that the 6 summands are coprime. Not every term is the sum of two coprime cubes. a(1) = A047696(3).
LINKS
Rosalie Fay, Table of n, a(n) for n = 1..664
EXAMPLE
4104 = 18^3 - 12^3 = 16^3 + 2^3 = 15^3 + 9^3, and 18, -12, 16, 2, 15, 9 are coprime, so 4104 is in the sequence.
CROSSREFS
KEYWORD
nonn
AUTHOR
Rosalie Fay, Oct 16 2017
STATUS
approved