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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A057733 Primes of the form 2^n + 3. 33
5, 7, 11, 19, 67, 131, 4099, 32771, 65539, 262147, 268435459, 1073741827, 36028797018963971, 147573952589676412931, 19342813113834066795298819, 431359146674410236714672241392314090778194310760649159697657763987459 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..25

MAPLE

for n from 1 to 2000 do `if`(isprime(2^n + 3)=true, 2^n + 3, NULL) od;

# alternative:

select(isprime, [seq(2^n+3, n=1..2000)]); # Robert Israel, Dec 28 2015

MATHEMATICA

Select[Table[2^n + 3, {n, 230}], PrimeQ] (* Jayanta Basu, May 23 2013 *)

PROG

(MAGMA) [ a: n in [0..250] | IsPrime(a) where a is 2^n+3 ] // Vincenzo Librandi, Aug 07 2010

(PARI) for(n=1, 99, if(ispseudoprime(t=2^n+3), print1(t", "))) \\ Charles R Greathouse IV, Jul 02 2013

CROSSREFS

Cf. A057732.

Sequence in context: A056208 A045441 A128841 * A174332 A248595 A266233

Adjacent sequences:  A057730 A057731 A057732 * A057734 A057735 A057736

KEYWORD

nonn

AUTHOR

G. L. Honaker, Jr., Oct 29 2000

EXTENSIONS

More terms from Francois Jooste (pin(AT)myway.com), Mar 17 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified July 22 10:45 EDT 2018. Contains 312891 sequences. (Running on oeis4.)