@markgritter @mattmcirvin given the Ulam square spiral and the Gaussian primes:
what's the probability that they're both prime?
What fraction of Ulam spiral primes are also Gaussian primes? What fraction of Gaussian primes are also Ulam spiral primes?
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I would not be surprised for the answers to be ill-defined without a bound of some sort, because the two sorts would drop off at different rates with distance from the origin.
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It does seem like an occasion for experiments, which I don't have time for at the moment, but...
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