I loosened the tolerance on the test for s = 2. Increasing the number of primes seems to degrade the accuracy after a certain point, and the result becomes farther from the value listed in sequence A085548 in the Online Encyclopedia of Integer Sequences. This solution should pass now.
linear least squares fitting
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Rounding off numbers to n decimals
Draw a 'X'!
Generate a list of composite numbers
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Play Outside In with primes
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