Chris problems are kinda my favourite :)
Very nice problem
Remove the two elements next to NaN value
Lychrel Number Test (Inspired by Project Euler Problem 55)
Draw a 'X'!
Compute the perimeter of an ellipse
Identify Wagstaff primes
Find pairs of primes with the same digit sum
Determine whether a prime is Pythagorean
Evaluate the prime zeta function
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