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A020414 Numbers k such that the continued fraction for sqrt(k) has period 75. 0
3217, 3313, 7237, 9209, 9466, 10249, 10765, 11521, 11785, 12442, 12757, 13709, 13757, 14125, 15577, 16897, 19421, 19577, 19786, 19913, 21562, 22277, 22837, 29765, 31517, 31741, 32458, 32489, 33202, 33893, 34165, 35153, 36506, 41845, 42314, 42802 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
cf75Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Length[ ContinuedFraction[ s][[2]]]]==75]; Select[Range[43000], cf75Q] (* Harvey P. Dale, Apr 17 2020 *)
CROSSREFS
Cf. A003285.
Sequence in context: A091329 A261241 A345772 * A202612 A295474 A283578
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified May 26 04:31 EDT 2024. Contains 372807 sequences. (Running on oeis4.)