Why are so many solutions lost?
Reverse Run-Length Encoder
Get the area codes from a list of phone numbers
Project Euler: Problem 5, Smallest multiple
Narcissistic number ?
Is it really a 5?
Divisible by n, prime divisors - 11, 13, 17, & 19
Lights Out 4 - 5x5, 8 moves
Lights Out 3 - 5x5, 6 moves
Divisible by n, prime vs. composite divisors
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