Create an n-by-n null matrix and fill with ones certain positions
Make a vector of prime numbers
Area of an Isoceles Triangle
Find indices of diagonal elements
Divisible by n, Truncated-number Divisors
Divisible by n, prime divisors - 11, 13, 17, & 19
Divisible by 9
Scrabble Scores - 12
Calculator spelling - Numbers to Letters
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