in problem's explantation, Example in "17" part, it probably is: "3281 is divisible by 17.", not 2392 ?
@bainhome: thanks for catching that; it's been fixed.
Which values occur exactly three times?
Find the two most distant points
Test for balanced parentheses
Flip the vector from right to left
Divisible by 3
Word Distance - Sum
Divisible by 7
Divisible by n, prime divisors from 20 to 200
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