The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A020443 Period of continued fraction for sqrt(n) contains exactly seven 1's. 1
 115, 135, 247, 464, 611, 744, 767, 1064, 1479, 2079, 2200, 2291, 2360, 2875, 3096, 3283, 3367, 3800, 4187, 4255, 4408, 4672, 4720, 4995, 5151, 5375, 5568, 5611, 5983, 6235, 6431, 6643, 6816, 6840, 6895, 7335, 7367, 7600, 8151, 8208, 8507, 8755, 8843 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..300 MATHEMATICA pcf7Q[n_]:=Module[{sr=Sqrt[n]}, !IntegerQ[sr]&&Count[ContinuedFraction[ sr][[2]], 1]==7]; Select[Range[9000], pcf7Q] (* Harvey P. Dale, Nov 27 2012 *) CROSSREFS Sequence in context: A105993 A036269 A036462 * A129544 A095621 A051975 Adjacent sequences: A020440 A020441 A020442 * A020444 A020445 A020446 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 28 01:34 EDT 2024. Contains 372900 sequences. (Running on oeis4.)