A031537 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 39.

1523, 1531, 1539, 1543, 1559, 1563, 1567, 1571, 1579, 1583, 1607, 1611, 1619, 1627, 1663, 1667, 1679, 6088, 6144, 6176, 6184, 6272, 6280, 6304, 6336, 6344, 6376, 6464, 6472, 6528, 6568, 6632, 6656, 6720, 13695, 13839, 13911, 13971, 14055, 14115, 14199

Offset

1,1

Links

Table of n, a(n) for n=1..41.

Crossrefs

Sequence in context: A318791 A087867 A073104 * A217387 A031717 A236880

Adjacent sequences: A031534 A031535 A031536 * A031538 A031539 A031540

Keyword

nonn

Author

David W. Wilson

Status

approved