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A031768 Numbers n such that least term in period of continued fraction for sqrt(n) is 90. 2
2026, 8102, 18228, 32404, 50630, 72906, 99232, 129608, 164034, 202510, 245036, 291612, 342238, 396914, 455640, 518416, 585242, 656118, 731044, 810020, 893046, 980122, 1071248, 1166424, 1265650, 1368926, 1476252, 1587628, 1703054, 1822530 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Comment from Franklin T. Adams-Watters, Feb 21 2009: A156856 is almost certainly a proper sequence of this sequence.

In fact the first term not of the form A156856(n)=(45n)^2+n is a(93) = 17147972, with contfrac(sqrt(17147972)) = [4141; [91, 90, 91, 8282]]. - M. F. Hasler, Feb 21 2009

The first term not of the form A156856(n)=(45n)^2+n is a(93) = 17147972, with contfrac(sqrt(17147972)) = [4141; [91, 90, 91, 8282]]. - M. F. Hasler, Feb 21 2009

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

CROSSREFS

Cf. A156856.

Sequence in context: A183999 A250811 * A156856 A031633 A031543 A031723

Adjacent sequences:  A031765 A031766 A031767 * A031769 A031770 A031771

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified November 18 02:54 EST 2017. Contains 294840 sequences.