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).
Number of Circles in a Number
Find the largest value in the 3D matrix
Side of an equilateral triangle
Pandigital number n°1 (Inspired by Project Euler 32)
Find Missing Number
Generalised Hamming Number
Find files with extension ext in the current directory
Longest Collatz Sequence
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