A perfect number occurs whent the sum of all divisors of a positive integer, except the number itself, equals the number.
28 = 1 + 2 + 4 + 7 + 14;
so return true
10 ~= 1 + 2 + 5
so return false
Remove all the words that end with "ain"
give nth decimal place of pi
Return elements unique to either input
find radius of cone
Find the maximum two numbers of every column of a matrix
Big Integer Sqrt
Put m balls into n boxes
Return fibonacci sequence do not use loop and condition
Project Euler: Problem 14 Longest Collatz sequence(harder version)
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