What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Numbers with prime factors 2, 3 and 5.
Sum the elements in either diagonal of a square matrix
Replace multiples of 5 with NaN
kmph to mps
Divisors for big integer
Longest Collatz Sequence
Decrypt the cypher using XOR encryption (for beginners)
Replicate elements in vectors
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