A064925 - OEIS

A064925

Period of continued fraction for sqrt(21)*n.

6, 2, 4, 2, 6, 2, 26, 8, 8, 8, 6, 2, 26, 30, 8, 12, 34, 8, 10, 8, 30, 6, 10, 4, 42, 22, 36, 22, 12, 4, 26, 28, 4, 26, 60, 8, 8, 10, 38, 4, 78, 26, 22, 8, 20, 14, 80, 8, 202, 38, 34, 26, 32, 32, 2, 60, 14, 16, 116, 4, 98, 30, 86, 64, 60, 4, 42, 32, 10, 48, 42, 12, 158, 4, 34, 18, 52

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OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..7300

MAPLE

f:= n -> nops(numtheory:-cfrac(sqrt(21)*n, 'periodic', 'quotients')[2]):

map(f, [$1..100]); # Robert Israel, Sep 12 2024

MATHEMATICA

Table[Length[ContinuedFraction[n Sqrt[21]][[2]]], {n, 80}] (* Harvey P. Dale, Sep 12 2023 *)

CROSSREFS

Sequence in context: A198502 A244858 A354782 * A173273 A084945 A372551

Adjacent sequences: A064922 A064923 A064924 * A064926 A064927 A064928

KEYWORD

nonn

AUTHOR

R. K. Guy, Oct 26 2001

STATUS

approved