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!)
A058765 Primes of the form 3^k - 2^k. 9
5, 19, 211, 129009091, 68629840493971, 617671248800299, 19383245658672820642055731, 14130386091162273752461387579, 1546132562196033990574082188840405015112916155251 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..12

FORMULA

a(n) = A001047(A057468(n)).

MAPLE

select(isprime, [seq(3^n - 2^n, n=0..200)]); # Muniru A Asiru, Mar 04 2018

MATHEMATICA

Select[Table[3^n-2^n, {n, 0, 2200}], PrimeQ] (* Vincenzo Librandi, Dec 08 2011 *)

PROG

(MAGMA) [a: n in [0..300] | IsPrime(a) where a is  3^n - 2^n]; // Vincenzo Librandi, Dec 08 2011

(GAP) Filtered(List([1..200], n->3^n - 2^n), IsPrime); # Muniru A Asiru, Mar 04 2018

(PARI) lista(nn) = for(k=1, nn, if(isprime(p=3^k-2^k), print1(p", "))) \\ Altug Alkan, Mar 04 2018

CROSSREFS

Cf. A001047 (3^n-2^n) and A057468 (k such that 3^k-2^k is prime).

Sequence in context: A102262 A123281 A135171 * A317340 A328716 A067967

Adjacent sequences:  A058762 A058763 A058764 * A058766 A058767 A058768

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 02 2001

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 August 9 12:53 EDT 2022. Contains 356026 sequences. (Running on oeis4.)