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A031553 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 55. 0
3027, 3031, 3051, 3067, 3079, 3083, 3091, 3099, 3119, 3139, 3147, 3151, 3163, 3167, 3179, 3187, 3191, 3203, 3239, 3247, 12104, 12128, 12160, 12192, 12200, 12288, 12296, 12384, 12392, 12416, 12448, 12480, 12520, 12608, 12672, 12680, 12704, 12776, 12800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

CROSSREFS

Sequence in context: A221249 A038544 A252142 * A031733 A185528 A334371

Adjacent sequences:  A031550 A031551 A031552 * A031554 A031555 A031556

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)