Find the sum of all the odd numbers in a matrix.
x = [2 3 5 7 1 4 11]
y = 27
Prime factor digits
Get the area codes from a list of phone numbers
How long is the longest prime diagonal?
Output any real number that is neither positive nor negative
Check that number is whole number
Alternately upper-lower case
most frequent character
index of n^2 in magic(n)
union without repitition
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