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A065098 Sum of reciprocals of terms in period of continued fraction for sqrt(n) is an integer. 0
239, 1839, 24627 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..3.

EXAMPLE

For n=239 the quotient periods are: [[15],[2,5,1,2,4,15,4,2,1,5,2,30]], (1/2)+(1/5)+1+(1/2)+(1/4)+(1/15)+(1/4)+(1/2)+1+(1/5)+(1/2)+(1/30) = 5.

MATHEMATICA

Do[ If[ IntegerQ[ Apply[ Plus, 1/Last[ ContinuedFraction[ Sqrt[n]]]]], Print[n]], {n, 2, 10^5 } ]

CROSSREFS

Cf. A003285, A010340.

Sequence in context: A201787 A118574 A142854 * A177204 A201194 A065750

Adjacent sequences:  A065095 A065096 A065097 * A065099 A065100 A065101

KEYWORD

nonn,bref

AUTHOR

Naohiro Nomoto, Nov 12 2001

STATUS

approved

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Last modified October 25 20:39 EDT 2014. Contains 248557 sequences.