Find the numeric mean of the prime numbers in a matrix.
Finding Perfect Squares
Project Euler: Problem 5, Smallest multiple
Find the index of n in magic(n)
Add 3 (x<=100) Or Subtract 100 and add 3(100<x)
A kind of decryption
The proportion of NaN in the data
The average of the second largest values
The great 82-year-old
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