A145552 Square numbers which can be expressed as the sum of 2 positive cubes in exactly 2 different ways.

6080256576, 49991146569, 389136420864, 799858345104, 3199433380416, 4432507043904, 8936757492481, 18476474674329, 21831536690929, 24904730935296, 35839080230625, 36443545848801, 51190934086656, 71197008860224, 95004009000000, 204763736346624, 283680450809856

Offset: 1

Author

Iain Renfrew (iain.renfrew(AT)btinternet.com), Oct 13 2008

Keywords

• nonn

Comments

This is conjectured to be an infinite sequence.

Examples

			a(1): 6080256576 = 77976^2 = 1824^3 + 228^3 = 1710^3 + 1026^3; a(2): 49991146569 = 223587^2 = 3666^3 + 897^3 = 3276^3 + 2457^3; a(3): 389136420864 = 623808^2 = 7296^3 + 912^3 = 6840^3 + 4104^3; a(4): 799858345104 = 894348^2 = 9282^3 + 546^3 = 9009^3 + 4095^3
		

Links

• Ray Chandler, Table of n, a(n) for n = 1..771

Crossrefs

Cf. A145553.

Extensions

Extended by Ray Chandler, Nov 22 2011