A020349 - OEIS

A020349

Numbers k such that the continued fraction for sqrt(k) has period 10.

43, 67, 86, 93, 115, 116, 118, 129, 154, 159, 161, 162, 186, 237, 242, 243, 245, 246, 259, 286, 292, 297, 339, 344, 345, 354, 375, 403, 411, 451, 452, 453, 459, 464, 465, 469, 475, 490, 494, 497, 515, 516, 522, 532, 534, 536, 543, 563, 583, 591, 594, 595, 598, 603, 616

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

cf10Q[n_]:=Module[{sr=Sqrt[n]}, !IntegerQ[sr]&&Length[ ContinuedFraction[ sr][[2]]]==10]; Select[Range[700], cf10Q] (* Harvey P. Dale, Mar 07 2012 *)

CROSSREFS

Contains A237604.

Sequence in context: A245742 A295702 A102269 * A050959 A273773 A139917

Adjacent sequences: A020346 A020347 A020348 * A020350 A020351 A020352

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved