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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.
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
OFFSET
1,1
CROSSREFS
Sequence in context: A179293 A097742 A115244 * A104391 A250753 A158312
KEYWORD
nonn
STATUS
approved