Question

Hat is the length of the hypotenuse, x, is a Pythagorean triple? 22 29 41 42

Answer 1

Of your numbers listed, 29 and 41 are the lengths of the hypotenuse of a Pythagorean triple.

Those triples are
  (20, 21, 29)
  (9, 40, 41)

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The On-Line Encyclopedia of Integer Sequences (OEIS) lists the hypotenuses of primitive triples as sequence number A020882.