A good opportunity to implement a hashtable: lots of collisions without it.
A re-post of Solution 1137054, because that one doesn't appear in the list of solutions, for some reason (I'm not sure why).
Remove the polynomials that have positive real elements of their roots.
Triangle Numbers Below N
Back to basics 1 - Saving
Create a Multiplication table matrix...
Without the French accent please!
Pandigital number n°1 (Inspired by Project Euler 32)
Narcissistic number ?
Generalised Hamming Number
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