I got tired of solving these problems. So, I just wrote a solution that works for everything.
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Doubling elements in a vector
Is it a number?
Mersenne Primes vs. All Primes
Self-similarity 2 - Every third term
Power Times (of the day)
Word Distance - Average Sort
Stress-Strain Properties - 6
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