login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A031426 Least term in period of continued fraction for sqrt(n) is 2. 1
2, 6, 12, 20, 28, 30, 41, 42, 55, 56, 72, 89, 90, 110, 126, 130, 131, 132, 155, 156, 177, 180, 182, 209, 210, 240, 269, 270, 272, 299, 303, 305, 306, 342, 368, 372, 377, 380, 418, 420, 451, 458, 462, 497, 504, 505, 506, 552, 590, 600, 646, 648 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[600], !IntegerQ[Sqrt[#]] && Min[ContinuedFraction[Sqrt[#]][[2]]] == 2&] (* Vincenzo Librandi, Feb 06 2012 *)

CROSSREFS

Sequence in context: A045619 A028690 A120344 * A175967 A034100 A034110

Adjacent sequences:  A031423 A031424 A031425 * A031427 A031428 A031429

KEYWORD

nonn,changed

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 12:41 EST 2012. Contains 205909 sequences.