A133325 Numbers such that 2*X^2-82 is a square.

7, 13, 29, 71, 167, 413, 973, 2407, 5671, 14029, 33053, 81767, 192647, 476573, 1122829, 2777671, 6544327, 16189453, 38143133, 94359047, 222314471, 549964829, 1295743693, 3205429927, 7552147687, 18682614733, 44017142429

Offset

1,1

Links

Table of n, a(n) for n=1..27.

Index entries for linear recurrences with constant coefficients, signature (0,6,0,-1).

Formula

The bisections modulo 2 satisfy the same recurrence relation a(n+2)=6*a(n+1)-a(n).

G.f.: -x*(x-1)*(7*x^2+20*x+7)/(x^2+2*x-1)/(x^2-2*x-1). - R. J. Mathar, Nov 14 2007

Crossrefs

Sequence in context: A230460 A182624 A096333 * A336117 A283709 A063583

Adjacent sequences: A133322 A133323 A133324 * A133326 A133327 A133328

Keyword

nonn

Author

Richard Choulet, Oct 18 2007

Status

approved