A031518 Numbers k such 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.

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

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