login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A075896 Primes of the form 2^n - n^2. 9
7, 79, 431, 130783, 523927, 2251799813682647, 9007199254738183, 2417851639229258349405791, 9671406556917033397642519, 664613997892457936451903530140158127 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..20

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

Cf. A061119.

Sequence in context: A176130 A014232 A154592 * A201475 A079911 A003545

Adjacent sequences:  A075893 A075894 A075895 * A075897 A075898 A075899

KEYWORD

nonn,easy

AUTHOR

Zak Seidov, Oct 17 2002

EXTENSIONS

More terms from Ralf Stephan, Mar 30 2003

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 26 12:19 EDT 2019. Contains 322472 sequences. (Running on oeis4.)