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.
Evened up (or not)
Inscribed Pentagon? 2
Large Sum (inspired by Project Euler 13)
Count the primes in Collatz sequences
Find integer solutions to an equation with a sum of binomial coefficients
Solve an ODE: equation for a 2D laminar jet
Solve a nonlinear difference equation
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