Prime rib does not involved prime numbers, but there are jokes. “Of course, then you’ll realise that you should be bridling every *prime* rib. 1, 2, 3, 5, 7, 11, 13” was posted on the newsgroup rec.kites on October 14, 1997.
 
“Sweet! Eat ‘em in orders of 2, 3, 5, 7 or 11… | RT @Foodimentary: Today is National Prime Rib Day” was posted on Twitter by David Garrison on April 27, 2010. “Recipe for Prime Rib: Salt, pepper, and butter. Cook for 2, 3, 5, 7 or 11 minutes” was posted on Twitter by “You know” on August 23, 2016.
 
“What beef only comes in 2, 3, 5, 7, or 11 ounce portions? Prime rib” was posted on Reddit—Dadjokes on May 15, 2020.
   
“What is the first derivative of a cow?”/“Prime rib” is another prime rib joke.   
           
 
Wikipedia: Standing rib roast
A standing rib roast, also known as prime rib, is a cut of beef from the primal rib, one of the nine primal cuts of beef. While the entire rib section comprises ribs six through 12, a standing rib roast may contain anywhere from two to seven ribs.
 
Google Groups: rec.kites
foil plan shapes
Andrew Beattie
10/14/97
(...)
>on later contemplation and a rough drawing one doesn’t actually need to
>do every rib in order to be able to bridle every 2nd or 3rd…..some can
>be left off, like the 2nd one in from the tip.
 
Of course, then you’ll realise that you should be bridling every *prime* rib.
1, 2, 3, 5, 7, 11, 13
 
Twitter
David Garrison
@DavidCGarrison
Sweet! Eat ‘em in orders of 2, 3, 5, 7 or 11… | RT @Foodimentary: Today is National Prime Rib Day.
5:10 PM · Apr 27, 2010·TweetDeck
 
Twitter
Kurt Schlichter
@KurtSchlichter
Technically, that’s only ribs nos. 1 ,2, 3, 5, 7, 11, 13, and 17. RT@Eric_Bartoszak Dude, don’t forget Prime Rib.
6:06 PM · Mar 25, 2011·Twitter Web Client
 
Twitter
Hoi
@hoiza
When I have a bunch of money, I’m opening a prime rib joint where you can only order 2, 3, 5, 7, 11, 13, 17, etc. cuts of prime rib.
12:22 PM · Apr 3, 2014·Twitter for iPhone
   
Twitter
Premium Bland
@AHundredElbows
“I’ll have the prime rib.”
“A fine choice. What size would you like? It comes in 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53
8:14 PM · Jan 6, 2015·Twitter for Android
 
Twitter
You know
@Tmoney68
Recipe for Prime Rib:
Salt, pepper, and butter.
Cook for 2, 3, 5, 7 or 11 minutes.
4:26 PM · Aug 23, 2016·Twitter for iPhone
 
Twitter
funky49
@funky49
Q: What’s the best cut of beef when serving 2, 3, 5, 7, 11, or 13 people? A: PRIME RIB!
12:01 PM · Sep 2, 2016·Twitter Web Client
   
Twitter
Julianne Brunetto
@JulesBrunetto
Recipe for Prime Rib:
Salt, pepper, and butter.
Cook for 2, 3, 5, 7 or 11 minutes.
7:13 AM · Nov 20, 2017·TestApp2_SendTweet
   
Twitter
jendurbent_ebooks
@JendurbentE
I might want to buy prime rib in divisions of 2, 3, 5, 7, 11, 13.
5:41 PM · Jun 6, 2018·jendurbent_ebooks
 
Twitter
Mike Wells
@mikewtfwells
I really love prime rib but I’m all about prime number ribs. They’re ribs of 1,3,5,7,11,13,17 and 19
6:28 PM · Feb 24, 2020·Twitter for iPhone
   
Reddit—Dadjokes
Posted by u/Sir_Pluses May 15, 2020
What beef only comes in 2, 3, 5, 7, or 11 ounce portions?
Prime Rib!
 
LaffGaff
ODD BEEF
By laffgaff May 15, 2020
What beef only comes in 2, 3, 5, 7, or 11 ounce portions?
Prime rib.