Write a function that will multiply every prime number in the array or matrix by two, leaving all other numbers the same, and return that de-primed array or matrix. One will be treated as prime in this problem.
One in not prime!!!
And therefore should not become de-primed.
Number of Circles in a Number
Return elements unique to either input
Multiply 2 numbers
length of a vector
Highly divisible triangular number (inspired by Project Euler 12)
Cycling — Normalized Power
Combined Ages 4 - Non-symmetric with multiples, n ≥ 3
Sphenic number sequence
Fraction of a fraction of a ...
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