Not really my solution... just a slightly cheating version of @bmtran's.
Counting in Finnish
Change the sign of even index entries of the reversed vector
Number of digits in an integer
Narcissistic number ?
Back to basics 15 - Benchmark
Back to basics 19 - character types
Back to basics 25 - Valid variable names
2 b | ~ 2 b
Toolbox check part 3
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