A031553 Numbers k such 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.

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

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