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(*
* Solution to Project Euler problem 64
* Copyright (c) Project Nayuki. All rights reserved.
*
* https://www.nayuki.io/page/project-euler-solutions
* https://github.com/nayuki/Project-Euler-solutions
*)
Length[Select[Range[10000], Function[x, !IntegerQ[Sqrt[x]] && OddQ[Length[Last[ContinuedFraction[Sqrt[x]]]]]]]]