17789
[Commentary:
Harriot lists his orders 13 to 22 of Pythagorean triples,
continuing in each case until the hypotenuse is equal to or greater than 1105.
Unfortunately an error in the last step of order 19 has led him to miss one of the triples ending in 1105:
the final set of differences should have been 38, 84, 84,
leading to the triple (817, 744, ]
5
&c. in
[Translation: etc. ]
[Translation: etc. ]