What does echo $((2#$1)) exactly does?

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Music by Eric Matyas
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Track title: Cosmic Puzzle

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Chapters
00:00 Question
00:31 Accepted answer (Score 76)
01:16 Answer 2 (Score 31)
02:30 Answer 3 (Score 26)
03:47 Thank you

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Full question
https://superuser.com/questions/1162555/...

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Tags
#bash

#avk47