A031565 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 67.

4491, 4499, 4507, 4519, 4523, 4539, 4547, 4567, 4579, 4583, 4587, 4591, 4603, 4639, 4643, 4651, 4659, 4663, 4679, 4691, 4703, 4707, 4723, 4731, 4751, 4759, 17960, 17992, 18016, 18048, 18056, 18080, 18112, 18152, 18208, 18272, 18280, 18304, 18344, 18376

Offset

1,1

Links

Table of n, a(n) for n=1..40.

Crossrefs

Sequence in context: A232200 A345600 A345859 * A031745 A225625 A184465

Adjacent sequences: A031562 A031563 A031564 * A031566 A031567 A031568

Keyword

nonn

Author

David W. Wilson

Status

approved