Additional test cases have been added.
I like this solution ! Simple and easy to read.
it took me quite a while to figure this one out.your coding thought keep stunning me.amazing idea!
Using forward&backward compare,don't see that before,awesome.
Return the 3n+1 sequence for n
Calculate the Levenshtein distance between two strings
sum of first 'n' terms
Find a Pythagorean triple
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