What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Test if a Number is a Palindrome without using any String Operations
Back to basics 21 - Matrix replicating
Multiply a column by a row
Sum the Digits of a Number
Area of an equilateral triangle
Permute diagonal and antidiagonal
Longest Collatz Sequence
Numbers spiral diagonals (Part 2)
Find Missing Number
Generalised Hamming Number
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