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
Find the palindrome
Given two strings, find the maximum overlap
Test if two numbers have the same digits
Triangular Tiling Dots in a Circle
Area of Triangle with Oblique Coordinates
Sum of all the divisors of n
Combinations using Stirling numbers of the second kind
RSA encryption using public key
Determine the kth Primitive Root of Unity
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