This doesn't use primes(x),but still feels a little like cheating.
Test if a Number is a Palindrome without using any String Operations
02 - Vector Variables 2
Side of an equilateral triangle
Sum of the Matrix Elements
Longest Collatz Sequence
Find the path through the cell
Decrypt the cypher using XOR encryption (for beginners)
Return a list sorted by number of consecutive occurrences
Without the French accent please!
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