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A031540 that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 42. 0
1766, 1774, 1782, 1814, 1822, 1826, 1838, 1842, 1858, 1874, 1878, 1886, 1894, 1922, 1926, 1934, 3972, 3981, 3993, 4038, 4101, 4107, 4116, 4143, 4161, 4179, 4188, 4197, 4209, 4254, 4269, 4281, 4287, 4317, 4341, 4353, 7060, 7076, 7108, 7116, 7124, 7132 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

CROSSREFS

Sequence in context: A343988 A031762 A031672 * A135795 A206201 A237900

Adjacent sequences:  A031537 A031538 A031539 * A031541 A031542 A031543

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified October 17 02:45 EDT 2021. Contains 348048 sequences. (Running on oeis4.)