

A233592


Natural numbers n such that the continued fraction expansion sqrt(n) = c(1)+c(1)/(c(2)+c(2)/(c(3)+c(3)/....)) is periodic.


3



2, 3, 5, 6, 8, 10, 11, 12, 15, 17, 18, 20, 24, 26, 27, 30, 35, 37, 38, 39, 40, 42, 44, 45, 48, 50, 51, 56, 63, 65, 66, 68, 72, 80, 82, 83, 84, 87, 90, 99, 101, 102, 104, 105, 108, 110, 120, 122, 123, 132, 143, 145
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OFFSET

1,1


COMMENTS

For more details on this type of expansions, see A233582.
The cases with aperiodic expansions are listed in A233593.
All the listed cases become periodic after just two leading terms (it is a conjecture that this behavior is general); the validity of their expansions was explicitly tested.


LINKS

Stanislav Sykora, Table of n, a(n) for n = 1..200
S. Sykora, Blazys' Expansions and Continued Fractions, Stans Library, Vol.IV, 2013, DOI 10.3247/sl4math13.001
S. Sykora, PARI/GP scripts for Blazys expansions and fractions, OEIS Wiki


EXAMPLE

Blazys' expansion of sqrt(2) is {1,2,4,4,4,4,4,...}, i.e., it has a periodic termination. Consequently, 2 is a member of this list.


PROG

(PROG) See the link.


CROSSREFS

Cf. A233593.
Cf. Blazys' expansions: A233582, A233584, A233585, A233586, A233587.
Sequence in context: A167056 A131614 A275202 * A138390 A257804 A285209
Adjacent sequences: A233589 A233590 A233591 * A233593 A233594 A233595


KEYWORD

nonn


AUTHOR

Stanislav Sykora, Jan 06 2014


STATUS

approved



