A031579 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 81.

6563, 6571, 6599, 6607, 6611, 6619, 6647, 6651, 6659, 6667, 6679, 6691, 6703, 6719, 6727, 6763, 6779, 6791, 6803, 6819, 6823, 6827, 6847, 6859, 6863, 6871, 6883, 6887, 26248, 26272, 26304, 26344, 26408, 26432, 26440, 26464, 26496, 26504, 26528, 26592

Offset

1,1

Links

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

Crossrefs

Sequence in context: A017564 A352036 A321812 * A288884 A031759 A145050

Adjacent sequences: A031576 A031577 A031578 * A031580 A031581 A031582

Keyword

nonn

Author

David W. Wilson

Status

approved