A273186 Taxi-cab numbers (A001235) n such that n+1 is the sum of two positive cubes (A003325).

18426689288, 20689194392, 166940780112, 3956149616328, 53611112714103, 562576374032408, 11110701930362937, 17146742033697471, 24658089729767487, 45512714439607464

Offset: 1

Author

Zak Seidov and Giovanni Resta, May 27 2016

Keywords

• nonn

Comments

Numbers n such that n+1 and n can be written, respectively, in at least one and two ways as the sum of two positive cubes.

Examples

			a(1) = 2514^3 + 1364^3 = 2498^3 + 1416^3, a(1)+1 = 2641^3 + 182^3.
a(2) = 2492^3 + 1734^3 = 2726^3 + 756^3,  a(2)+1 = 2282^3 + 2065^3.
		

Crossrefs

Cf. A001235, A003325.