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9999713179999 is prime

MathsJam Conference 2024 (02/11/2024).

Primes that can be reversed to give another prime are called emirp. Concatenating a prime and an emirp, overlapping the middle digit, gets you a primemirp. Peter played around with these after Katie Steckles spoke about them in a Finite Group livestream. His playing led to some code that found new values not listed in the On-Line Encyclopedia of Integer Sequences - but they are now!