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

0, 1, 9, 784

Offset

1,3

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.

Links

Table of n, a(n) for n=1..4.

Prog

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

Crossrefs

Cf. A303143.

Sequence in context: A246125 A246126 A091057 * A303143 A137065 A272853

Adjacent sequences: A168254 A168255 A168256 * A168258 A168259 A168260

Keyword

nonn,fini,full

Author

Zak Seidov, Nov 21 2009

Status

approved