What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
letter yes yes & letter no no
Get the length of a given vector
Vectorize the digits of an Integer
Equal to their cube
What number has this problem?
Decrypt the cypher using XOR encryption (for beginners)
Rank of magic square (for beginners)
Find the path through the cell
Expression or variable?
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