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Old 2018-09-09, 18:43   #5
alpertron
 
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Aug 2002
Buenos Aires, Argentina

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Now the calculation of sum of squares uses GCD of Gaussian integers (for two squares) and GCD of quaternions (for four squares).

The GCD takes about 1 second for numbers of 10000 digits (I tested that with the smallest gigantic prime, which is 109999 + 33603). Most of the time is used for a modular power.

With the previous version, computing the sum of four squares would have taken about one hour.

I will continue doing more tests, and if everything works OK, I will move the new Web application to the "standard" URL.
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