Narcissistic number is a number that is the sum of its own digits each raised to the power of the number of digits.
153 = 1^3 + 5^3 + 3^3
101 ~= 1^3 + 0 ^3 + 1^3
Angle between two vectors
How long is the longest prime diagonal?
Divisors of an integer
Maximum value in a matrix
Project Euler: Problem 14 Longest Collatz sequence(harder version)
Find the right number make the equation
Make an anonymous function that has variable output
Determine if input is a perfect number
Return fibonacci sequence do not use loop and condition version 3
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