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Search: id:A031407
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A031407 Numbers n such that continued fraction for sqrt(n) has even period and central term 4. +0
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18, 22, 34, 39, 57, 68, 69, 76, 78, 92, 105, 108, 116, 124, 140, 150, 155, 174, 186, 203, 205, 217, 220, 259, 264, 266, 282, 294, 301, 308, 318, 329, 333, 369, 371, 376, 378, 406, 410, 413, 423, 434, 450, 456, 477, 490, 495, 504, 517, 522, 549 (list; graph; listen)
OFFSET

1,1

CROSSREFS

Sequence in context: A121851 A049734 A096282 this_sequence A002505 A050772 A086473

Adjacent sequences: A031404 A031405 A031406 this_sequence A031408 A031409 A031410

KEYWORD

nonn

AUTHOR

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

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.


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