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.
Reverse Run-Length Encoder
Replace multiples of 5 with NaN
Find the last non-zero digit in a primorial
Test approximations of the prime counting function
Sum the elements in rows of the Levine triangle
List the cuban primes
Evaluate the prime zeta function
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