The Goldbach Conjecture
Implement a ROT13 cipher
Return the first and last characters of a character array
Divisible by n, prime divisors from 20 to 200
Crunch that matrix!
Decipher the number 3 - 10 keys
Decipher the message - same key for all digits
Cipher or Decipher the number according to the second input - 1 key for all digits
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