The contents of the Illegal prime page were merged into Illegal number on 29 October 2021. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see its talk page.
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OP is asking for examples. And I agree with OP, the article is lacking a list of examples of numbers that are (internationally) illegal (and even the ones that are illegal in select countries are baked into large portions of text without clear formatting to be found at a glance when skimming). The closest is the "Other examples" section, where it only mentions ones made illegal in specific contexts (jerseys), where someone has been charged (no mention of the results), and what specific companies opted to do as internal policy to avoid censure (valve asking nintendo; chinese search engines).
This edit request by an editor with a conflict of interest has now been answered.
The section in "Flags and stenography" about the "Wii Common Key" free speech flag is based on an archived link to a reddit thread, rather than a notable secondary source. Some Google searching has only turned up the original Reddit thread and this Wikipedia page, so it's highly unlikely that another notable source references this. The remainder of the paragraph is redundant with the entry in "Other examples".
Because the paragraph in question concerns a product manufactured by the Nintendo corporation, and owing to the similarity of that company with certain characteristics of my username, it's my practice to avoid editing articles covering that company or any of its products in order to avoid the appearance of being a company-related user account. Pinging Xan747 or any other review editor to handle this request. Regards, Spintendo03:04, 20 July 2023 (UTC)[reply]
Partly done: I removed the text relying on the Reddit post. Since the Wii flag image ostensibly relies on the same source, I have also removed it. Rather totally remove the rest of the paragraph, and its citation, I am working on consolidating the information from the two RS into the Other examples section. Will notify you when complete. Xan747 (talk) 12:50, 20 July 2023 (UTC)[reply]
Done: I deleted the paragraph in the Flags and steganography section, but added the citation to the Other examples section. I decided to leave the Other examples section mostly as is; however, the actual cryptographic key was embedded as a note, which is WP:SYNTH as it was not published in either of the supporting citations, and is a potential WP:COPYVIO to boot, so I removed it.
NOTE: An argument could be made that the entire example is SYNTH since neither source specifically identifies the encryption key as an illegal number. I'll leave that discussion to other editors.