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A031518 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 20. 0
402, 418, 422, 446, 454, 466, 478, 482, 903, 921, 933, 939, 942, 948, 993, 1014, 1029, 1041, 1047, 1077, 1086, 1604, 1612, 1636, 1644, 1660, 1676, 1684, 1700, 1708, 1724, 1732, 1740, 1756, 1772, 1780, 1788, 1796, 1804, 1820, 1828, 1836, 1844, 1852, 1868 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

CROSSREFS

Sequence in context: A179293 A097742 A115244 * A104391 A250753 A158312

Adjacent sequences:  A031515 A031516 A031517 * A031519 A031520 A031521

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 21 12:48 EDT 2022. Contains 353908 sequences. (Running on oeis4.)