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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.
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
OFFSET
1,1
CROSSREFS
Sequence in context: A221249 A038544 A252142 * A031733 A185528 A334371
KEYWORD
nonn
STATUS
approved