The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A020367 Numbers k such that the continued fraction for sqrt(k) has period 28. 0
 334, 487, 501, 599, 716, 719, 814, 869, 926, 1004, 1031, 1099, 1125, 1169, 1214, 1244, 1246, 1333, 1414, 1434, 1437, 1473, 1529, 1557, 1559, 1564, 1607, 1648, 1696, 1719, 1807, 1817, 1823, 1916, 1977, 1978, 2032, 2065, 2087, 2140, 2324, 2329, 2350, 2382 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA cf28Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Length[ ContinuedFraction[ s][[2]]]]==28]; Select[Range[2400], cf28Q] (* Harvey P. Dale, Mar 10 2019 *) CROSSREFS Sequence in context: A158859 A182098 A331411 * A254705 A184463 A303210 Adjacent sequences:  A020364 A020365 A020366 * A020368 A020369 A020370 KEYWORD nonn AUTHOR STATUS approved

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

Last modified December 6 15:23 EST 2021. Contains 349563 sequences. (Running on oeis4.)