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EXAMPLE
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23 is in the sequence because it is the first followed by 47, 96, 98, 119, 128, ... all exhibiting the following property:sqrt(23) = [4;1, 3, 1, 8], sqrt(47) = [6;1, 5, 1, 12], sqrt(96) = [9;1, 3, 1, 18], sqrt(98) = [9;1, 8, 1, 18], sqrt(119) = [10;1, 9, 1, 20], sqrt(128) = [11;3, 5, 3, 22], ... i.e. the continued fraction expansion of their square roots have palindrome parts which concatenate respectively to the 3-digit palprimes 131, 151, 131, 181, 191, 353, ...
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