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

1,1

Comments

This is conjectured to be an infinite sequence.

Links

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

Example

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

Crossrefs

Cf. A145553.

Sequence in context: A034646 A234378 A046894 * A290502 A172663 A210727

Adjacent sequences: A145549 A145550 A145551 * A145553 A145554 A145555

Keyword

nonn

Author

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

Extensions

Extended by Ray Chandler, Nov 22 2011

Status

approved