A168257 Numbers k with property that 4 + 2*k + 3*k^3 is a square.

0, 1, 9, 784

Offset: 0

Author

Zak Seidov, Nov 21 2009

Keywords

• fini
• full
• nonn

Comments

4 + 2*k + 3*k^3 = m^2 with k = {0,1,9,784} = {0,1,3,28}^2, and m = 2,3,47,38022.

Programs

Magma

[n: n in [0..10000000]|IsSquare(4+2*n+3*n^3)] // Vincenzo Librandi, Dec 16 2010