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A031509 Numbers n such that continued fraction for sqrt(n) has even period and central term 11. 0
123, 127, 131, 139, 151, 163, 167, 488, 512, 520, 544, 608, 640, 672, 1095, 1167, 1383, 1455, 1515, 1944, 2008, 2136, 2264, 2456, 2648, 2696, 3035, 3115, 3215, 3235, 3415, 3515, 3635, 3715, 3735, 3835, 3935, 4115, 4135, 4215, 4368, 4944, 5496, 5943, 5971 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

CROSSREFS

Sequence in context: A125097 A192231 A077378 * A119426 A138059 A179127

Adjacent sequences:  A031506 A031507 A031508 * A031510 A031511 A031512

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified February 16 16:00 EST 2012. Contains 205938 sequences.