User:CmdrDan/Area Codes, weren't there previously redirects

I recently searched for some telephone area codes and was surprised when I got links to three digit year articles.

Perhaps my memory is clouded. I remember disambiguation pages for three digit numbers--but again, I might be wrong.

I find it odd, however, that two area code searches took me to the articles about three digit years and these articles lacked hat notes to disambiguation pages.

Digging a bit deeper I found the template Year dab whose purpose is clear:

...to put disambiguation links at the top of year articles, such as 2020. It explains that the article is about the year and if it exists, it links to the number and a disambiguation page.

I think that means that the template {{Year dab will display the disambiguation page only if that page exists... But I think this Year dab is using a heuristic; it's relying on a naming convention.

But again, I might be wrong.

Specifically, I searched for 315 and 415. I have to add that on my browser I have added

This article is about the year 201. For the number, see 201 (number). For other uses, see 201 (disambiguation).

This article is about the year 202. For the number, see 202 (number). For other uses, see 202 (disambiguation).

This article is about the year 203. For the number, see 203 (number). For other uses, see 203 (disambiguation).

This article is about the year 204. For the number, see 204 (number). For other uses, see 204 (disambiguation).

This article is about the year 205. For the number, see 205 (number). For other uses, see 205 (disambiguation).

This article is about the year 206. For the number, see 206 (number).

This article is about the year 207. For the number, see 207 (number).

This article is about the year 208. For the number, see 208 (number).

This article is about the year 212. For the number, see 212 (number). For other uses, see 212 (disambiguation).

This article is about the year 213. For the number, see 213 (number). For other uses, see 213 (disambiguation).

This article is about the year 214. For the number, see 214 (number). For other uses, see 214 (disambiguation).

This article is about the year 215. For the number, see 215 (number). For other uses, see 215 (disambiguation).

This article is about the year 216. For the number, see 216 (number). For other uses, see 216 (disambiguation).

This article is about the year 217. For the number, see 217 (number). For other uses, see 217 (disambiguation).

This article is about the year 218. For the number, see 218 (number).

This article is about the year 301. For the number, see 301 (number). For other uses, see 301 (disambiguation).

This article is about the year 302. For the number, see 302 (number). For other uses, see 302 (disambiguation).

This article is about the year 303. For the number, see 303 (number). For other uses, see 303 (disambiguation).

This article is about the year 304. For the number, see 304 (number). For other uses, see 304 (disambiguation).

This article is about the year 305. For the number, see 305 (number). For other uses, see 305 (disambiguation).

This article is about the year 306. For the number, see 306 (number). For other uses, see 306 (disambiguation).

This article is about the year 307. For the number, see 307 (number). For other uses, see 307 (disambiguation).

This article is about the year 312. For the number, see 312 (number). For other uses, see 312 (disambiguation).

This article is about the year 313. For the number, see 313 (number). For other uses, see 313 (disambiguation).

This article is about the year 314. For other uses, see 314 (disambiguation).

This article is about the year 316. For other uses, see 316 (disambiguation).

This article is about the year 319. For other uses, see 319 (disambiguation).

This article is about the year 401. For other uses, see 401 (disambiguation).

This article is about the year 404. For other uses, see 404 (disambiguation).

This article is about the year 405. For other uses, see 405 (disambiguation).

This article is about the year 406. For other uses, see 406 (disambiguation).

This article is about the year 414. For other uses, see 414 (disambiguation).

This article is about the year 416. For other uses, see 416 (disambiguation).

This article is about the year 419. For other uses, see 419 (disambiguation).

This article is about the year 501. For the number, see 501 (number). For other uses, see 501 (disambiguation).

This article is about the year 502. For other uses, see 502 (disambiguation).

This article is about the year 503. For other uses, see 503 (disambiguation).

This article is about the year 504. For other uses, see 504 (disambiguation).

This article is about the year 505. For other uses, see 505 (disambiguation).

This article is about the year 512. For the number, see 512 (number). For other uses, see 512 (disambiguation).

This article is about the year 515. For other uses, see 515 (disambiguation).

This article is about the year 601. For other uses, see 601 (disambiguation).

This article is about the year 603. For other uses, see 603 (disambiguation).

This article is about the year 604. For other uses, see 604 (disambiguation).

This article is about the year 613. For the number, see 613 (number).

This article is about the year 614. For other uses, see 614 (disambiguation).

This article is about the year 616. For the number, see 616 (number).

This article is about the year 618. For other uses, see 618 (disambiguation).

This article is about the year 701. For other uses, see 701 (disambiguation).

This article is about the year 702. For other uses, see 702 (disambiguation).

This article is about the year 712. For other uses, see 712 (disambiguation).

This article is about the year 717. For other uses, see 717 (disambiguation).

This article is about the year 801. For the number, see 801 (number). For other uses, see 801 (disambiguation).