A066958 Number of ordered primitive solutions (x,y,z) to xy + yz + zx = n with x,y,z >= 1.

0, 0, 1, 0, 3, 0, 3, 3, 3, 0, 9, 0, 3, 6, 6, 3, 9, 0, 9, 6, 6, 0, 15, 6, 3, 12, 9, 0, 15, 0, 15, 9, 6, 6, 18, 6, 3, 12, 18, 6, 21, 0, 9, 12, 6, 6, 27, 6, 9, 12, 18, 6, 15, 12, 18, 18, 6, 0, 33, 0, 15, 18, 18, 9, 18, 12, 9, 18, 18, 0, 39, 6, 9, 24, 18, 12, 18, 0, 27, 18, 15, 6, 33, 12, 6, 24, 30

Offset: 1

Author

Colin Mallows, Jan 26 2002

Keywords

• nonn
• easy

Links

• T. D. Noe, Table of n, a(n) for n=1..1000

Crossrefs

Cf. A066851.

Extensions

More terms from Vladeta Jovovic, Apr 14 2002