The hardest thing is to use a hexadecimal input. Most on-line sites deal only with text. Exception: https://emn178.github.io/online-tools/sha256.html
Return the first and last characters of a character array
Rotate input square matrix 90 degrees CCW without rot90
Permute diagonal and antidiagonal
Finite Continued Fraction
Convert base 10 to base x (2-16)
Optimal Asymmetric Encryption Padding decoding of message for RSA Cryptography
Convert Hexadecimal Number to Decimal Number
Find the Arc Length of the Curve Defined by the Parametric Functions
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