Guess the password or break the lock.
And this problem is much easier than others you solved here!! ;-)
Sorry, I was tempted by the 'break the lock' part... :)
The Tower of Hanoi
Sum all integers from 1 to 2^n
Project Euler: Problem 10, Sum of Primes
Colon operator of two vectors
Modify subscripts - easier
Optimum Egyptian Fractions
Pernicious Anniversary Problem
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