A031538 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 40.

1602, 1606, 1622, 1634, 1646, 1654, 1678, 1686, 1698, 1718, 1726, 1734, 1762, 3603, 3639, 3669, 3678, 3684, 3693, 3711, 3756, 3777, 3783, 3801, 3837, 3849, 3873, 3891, 3909, 3921, 3957, 3966, 6404, 6412, 6428, 6436, 6444, 6452, 6476, 6484, 6500, 6508

Offset

1,1

Links

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

Crossrefs

Sequence in context: A078958 A031758 A154505 * A202774 A293370 A352092

Adjacent sequences: A031535 A031536 A031537 * A031539 A031540 A031541

Keyword

nonn

Author

David W. Wilson

Status

approved