login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A096723 Numbers n such that 3^n has the form 2p-+1 where p is prime. 1
1, 2, 3, 4, 7, 13, 16, 32, 64, 71, 103, 541, 1091, 1367, 1627, 4177, 9011, 9551, 36913, 43063, 49681, 57917, 483611, 877843, 2215303, 2704981, 3598867 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
For the corresponding primes p see A088553.
For n > 1, numbers n such that (3^n + (-1)^n)/2 is prime. - Thomas Ordowski, Dec 26 2016
LINKS
MATHEMATICA
Select[Range[4200], Or@@PrimeQ[(3^#+{1, -1})/2]&] (* Harvey P. Dale, Mar 05 2013 *)
CROSSREFS
Sequence in context: A200088 A004783 A031149 * A266498 A137495 A341531
KEYWORD
nonn,more
AUTHOR
Lekraj Beedassy, Jul 05 2004
EXTENSIONS
More terms from Ray Chandler, Jul 09 2004
a(25)-a(27) (from A028491 and A171381) from Tyler Busby, Mar 22 2023
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 15 04:16 EDT 2024. Contains 371667 sequences. (Running on oeis4.)