You're *very* close with this one. Remember that r is input as a double, not a string.
Project Euler: Problem 8, Find largest product in a large string of numbers
Sum of diagonal of a square matrix
Duplicate each element of a vector.
Circular Primes (based on Project Euler, problem 35)
Longest run of consecutive numbers
I've got the power! (Inspired by Project Euler problem 29)
A matrix of extroverts
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