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URL: https://oeis.org/A122724

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A122724
Primes p such that (2p)! - 1 is also prime.
0
2, 3, 7, 19, 47, 83, 487
OFFSET
1,1
COMMENTS
Corresponding primes of the form (2p)! - 1 are {23,719,87178291199,523022617466601111760007224100074291199999999,...}.
No other terms < 20663. - Robert Price, Mar 02 2012
No other terms < 104002 using A002982. - Michael S. Branicky, May 14 2025
MATHEMATICA
Select[Prime[Range[100]], PrimeQ[(2#)!-1]&] (* James C. McMahon, Nov 09 2024 *)
CROSSREFS
Sequence in context: A229290 A389249 A246033 * A256758 A033844 A037028
KEYWORD
hard,more,nonn
AUTHOR
Alexander Adamchuk, Sep 23 2006
STATUS
approved