I notice that if you go to the iTunes music store, the URL of every podcast ends in &s=143441. I see that the id numbers that appear before the &s=143441 are unique, but after the id number, they all end in &s=143441.
That's right, it specifies the Storefront, or Country, where the link was created. It's actually not necessary to create a working link for a podcast; that is, your podcast would link just as well as:
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What does the &s=143441 do for a podcast URL?
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