Superb job of not giving away answers in the test suite.
The solutions for x<-1 would require y^2<0.
William, expand the right side.
vectorization in N
Create matrix with Gray code
List prime anagrams of a number
Evaluate the zeta function for complex arguments
Count alternating permutations
Solve a ballot counting problem
Find the zeros of the Bessel function of the first kind
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