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A308720 The maximum value in the continued fraction of sqrt(n), or 0 if there is no fractional part. 0
0, 0, 2, 2, 0, 4, 4, 4, 4, 0, 6, 6, 6, 6, 6, 6, 0, 8, 8, 8, 8, 8, 8, 8, 8, 0, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 0, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 0, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 0, 16, 16, 16, 16, 16, 16, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

The continued fraction expansion of sqrt(n) is periodic, and the maximal element is the last element in the period, 2*floor(sqrt(n)).

LINKS

Table of n, a(n) for n=0..71.

Oskar Perron, Die Lehre von den Kettenbr├╝chen, B. G. Teubner (1913), section 24, p. 87.

FORMULA

a(k^2) = 0.

a(m) = floor(sqrt(m)) for nonsquare m.

a(n) = 2 * A320471(n) for n > 0.

MATHEMATICA

{0} ~Join~ Table[2 Mod[Floor@ Sqrt@ n, Ceiling@ Sqrt@ n], {n, 100}] (* Giovanni Resta, Jun 29 2019 *)

CROSSREFS

Cf. A000196, A003285, A096494.

Sequence in context: A073469 A307076 A342472 * A086882 A341415 A328141

Adjacent sequences:  A308717 A308718 A308719 * A308721 A308722 A308723

KEYWORD

nonn,easy

AUTHOR

Karl Fischer, Jun 19 2019

EXTENSIONS

More terms from Giovanni Resta, Jun 29 2019

STATUS

approved

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Last modified August 14 05:20 EDT 2022. Contains 356110 sequences. (Running on oeis4.)