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Hello Mr. Sebresos,
Thank you for contacting the History Hub regarding the passenger list annotations. The numbers in question are Alien Registration number. Here's a link to help you understand the origin of the AR number. The document also explains how to request the registration file. I did see a few alien registration databases online, you may also google or look in ancestry.com or familysearch.org.
I hope this information is helpful. Best of luck with your research.
Thank you so much for finding an answer to this question. I only noticed that the embedded, "Here's a link" doesn't seem to be working for me. Could you send the original URL?
Thank you again,