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A075896
Primes of the form 2^k - k^2.
9
7, 79, 431, 130783, 523927, 2251799813682647, 9007199254738183, 2417851639229258349405791, 9671406556917033397642519, 664613997892457936451903530140158127, 784637716923335095479473677900958302012794430558004278391
OFFSET
1,1
LINKS
FORMULA
a(n) = A024012(A072180(n)). - Elmo R. Oliveira, Feb 18 2025
MATHEMATICA
Select[Table[2^n - n^2, {n, 500}], PrimeQ] (* Vincenzo Librandi, Dec 07 2011 *)
PROG
(PARI) for(n=2, 10^7, if(isprime(2^n-n^2), print1(2^n-n^2", ")))
(Magma) [a: n in [1..200] | IsPrime(a) where a is 2^n-n^2]; // Vincenzo Librandi, Dec 07 2011
CROSSREFS
Primes in A024012.
Sequence in context: A176130 A014232 A154592 * A201475 A079911 A003545
KEYWORD
nonn,easy,changed
AUTHOR
Zak Seidov, Oct 17 2002
EXTENSIONS
More terms from Ralf Stephan, Mar 30 2003
STATUS
approved