E228 -- De numeris, qui sunt aggregata duorum quadratorum

(On numbers which are the sum of two squares)


Euler does some examples determining whether certain numbers, like 100981 and 1000009 are prime (yes, and no respectively). Primality testing seems to be his big application here.

According to C. G. J. Jacobi, a treatise with this title was read to the Berlin Academy on March 20, 1749.

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