What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Which doors are open?
Back to basics 6 - Column Vector
Reverse the elements of an array
Number of Even Elements in Fibonacci Sequence
Can you beat the lottery again (for hardcore coder) ?
Narcissistic number ?
Find the path through the cell
Generalised Hamming Number
Two functions (to be sure)
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