... a mathematical solution hiding in plain sight.

Perhaps better to say "hiding in obscurity." From the OP (emphasis added):

... find a missing number if in a list of numbers. ...

...
my @arr = (19,17,22,23,24,15,16,25..35);
...

But the list in the code example clearly has more than one missing number. See also the (current) thread title. I think the goose chase, although wild, was justified.

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: Find the missing number by AnomalousMonk
in thread Better way of writing "find the missing number(s)" by pritesh_ugrankar

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