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A065030 Period length of the continued fraction for sqrt(5)*n is 2. 0
2, 4, 9, 18, 34, 36, 68, 72, 161, 322, 323, 483, 610, 644, 646, 966, 1220, 1288, 1292, 1449, 1932, 2576, 2889, 2898, 3355, 3864, 5778, 5796, 6710, 7728, 9455, 10946, 11556, 11592, 13420, 18910, 21892, 23112, 23184 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

MATHEMATICA

Select[ Range[ 25000], Length[ Last[ ContinuedFraction[ Sqrt[5] *# ]]] == 2 & ]

CROSSREFS

Cf. A064933.

Sequence in context: A034685 A046683 A065055 * A103321 A138196 A298404

Adjacent sequences:  A065027 A065028 A065029 * A065031 A065032 A065033

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Nov 02 2001

STATUS

approved

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Last modified June 24 06:17 EDT 2021. Contains 345416 sequences. (Running on oeis4.)