A051383 Sum of two (possibly negative) cubes in at least 3 ways.

728, 3367, 4104, 5824, 5859, 19656, 26936, 32832, 46592, 46683, 46872, 65728, 68913, 90909, 91000, 101528, 110808, 124488, 134379, 152551, 155736, 157248, 158193, 165464, 168112, 184464, 195841, 205352, 215488, 249704, 262656

Offset: 1

Author

Colin Mallows

Keywords

• nonn

Examples

			4104 = 18^3 + (-12)^3 = 16^3 + 2^3 = 15^3 + 9^3, so 4104 is in the sequence.
		

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..34042

Crossrefs

Cf. A051347, A051384.

Programs

PARI

is(n)=#thue(thueinit(z^3+1),n)>4 \\ Ralf Stephan, Oct 18 2013