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A081296 Primes of the form 2^k - k. 10

%I #30 Mar 03 2022 01:44:53

%S 2,5,503,8179,524269,2097131,36028797018963913,

%T 3705346855594118253554271520278013051304639509300498049262642688253220148477691

%N Primes of the form 2^k - k.

%C Primes in A000325.

%C The corresponding k are given in A048744.

%C Next term a(9) contains roughly 1000 digits and is too large to include. - _R. J. Mathar_, Jul 15 2007

%F a(n) = 2^A048744(n) - A048744(n). - _R. J. Mathar_, Jul 22 2009

%t Select[Table[2^n-n,{n,300}],PrimeQ] (* _Harvey P. Dale_, Nov 24 2018 *)

%o (PARI) { for(k=1,100000, if(isprime(2^k-k), print1(2^k-k,", ")));} \\ _R. J. Mathar_, Jul 15 2007

%Y Cf. A048744 (k such that 2^k - k is prime).

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Apr 20 2003

%E More terms from _R. J. Mathar_, Jul 15 2007

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Last modified April 24 02:28 EDT 2024. Contains 371917 sequences. (Running on oeis4.)