Create a matrix X, where each column is a shifted copy of the vector v
Sum the Digits of a Number
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Find last zero for each column
Rounding off numbers to n decimals
BLOCK x3 (Version 4)
Permute diagonal and antidiagonal
Magic is simple (for beginners)
Generalised Hamming Number
Divisors for big integer
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