Test for randomness could be tightened (cf. Solution 1490988).
Summing Digits within Text
The Goldbach Conjecture
Distance walked 2D
Number of Circles in a Number
Arrange vector in ascending order
02 - Vector Variables 5
02 - Vector Variables 1
03 - Matrix Variables 1
03 - Matrix Variables 3
07 - Common functions and indexing 4
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