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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. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 16 11:47 EDT 2021. Contains 347472 sequences. (Running on oeis4.)