Find the numeric mean of the prime numbers in a matrix.
The Goldbach Conjecture
Find the sum of the elements in the "second" diagonal
Area of an equilateral triangle
Matrix problem for beginners
Approximate functions 2 (★★★★)
Triangle Numbers (★★)
Longest run of consecutive numbers (★★★★★)
Extract leading non-zero digit (★★★★★)
Create logarithmically spaced values (★)
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