A261247 Positive fundamental solution x(n) of the generalized Pell equation X^2 - D(n) Y(n) = 2 with D(n) = A261246(n).

2, 3, 4, 5, 39, 6, 156, 7, 8, 59, 9, 1464, 10, 477, 11, 2175, 12, 41571, 88, 13, 2999, 14, 127539, 244, 15, 108, 2489, 16, 373, 340551, 17, 2068, 4109, 18, 7987764, 11427, 19, 137913, 406200, 137, 334, 2709, 20, 12311, 21, 10496, 15732537, 40215912, 1729, 22, 7204587, 157, 64719

Offset

1,1

Comments

For the corresponding positive fundamental solution y(n) see A261248(n).

[x(n), y(n)] gives the positive proper fundamental solution for D(n) = A261246(n), for n >= 1.

See the comments on A261246 for this generalized Pell equation.

Links

Table of n, a(n) for n=1..53.

Example

See A261246.

Crossrefs

Cf. A261246, A261248.

Sequence in context: A252079 A324276 A324277 * A153719 A024637 A037328

Adjacent sequences: A261244 A261245 A261246 * A261248 A261249 A261250

Keyword

nonn

Author

Wolfdieter Lang, Sep 06 2015

Status

approved