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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.

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`%I #12 Jul 06 2024 16:05:18
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`%S 3027,3031,3051,3067,3079,3083,3091,3099,3119,3139,3147,3151,3163,
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`%T 3167,3179,3187,3191,3203,3239,3247,12104,12128,12160,12192,12200,
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`%U 12288,12296,12384,12392,12416,12448,12480,12520,12608,12672,12680,12704,12776,12800
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`%N 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.
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`%K nonn
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`%O 1,1
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`%A _David W. Wilson_
`