Number in Number-squared Consider a sequence of natural numbers for which N appears as a substring in N^2. A018834
Output the nth element of this sequence.
Rules
Program takes only n as input and outputs just one number - N.
The sequence can be 0-indexed or 1-indexed.
Sequence: 1 5 6 10 25 50 60 76 100 250 376 500 600 625 760 ...
Squares:  1 25 36 100 625 2500 3600 5776 10000 62500 141376 250000 360000 390625 577600 ...

This is code-golf so shortest code wins.
Perl 6, 33 31 bytes

-2 bytes thanks to nwellnhof



{(grep {$^a²~~/$a/},1..*)[$_]}


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Explanation:

{                            }  # Anonymous code block that returns
 (                      )[$_]   # The nth index of
  grep {          },1..*        # Filtering from the natural numbers
        $^a²                    # If the square of the number
            ~~/$a/              # Contains the number