this problem could use some nontrivial testcases
Project Euler: Problem 10, Sum of Primes
Project Euler: Problem 16, Sums of Digits of Powers of Two
Find the "ordinary" or Euclidean distance between A and Z
Is this triangle right-angled?
Least common multiple of many numbers
give nth decimal place of pi
Dick Van Dyck?
Filter AC, pass DC
Simple spirometer - find your lung capacity from the number and size of soap bubbles in one breath
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