login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A171058 Numbers k such that 3^k + 3*k + 1 is prime. 4

%I

%S 0,1,3,41,45,83,95,181,193,195,311,325,901,1825,3649,7709,16335,45547

%N Numbers k such that 3^k + 3*k + 1 is prime.

%o (PARI) is(n)=ispseudoprime(3^n+3*n+1) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Numbers k such that b^k + b*k + 1 is prime: A301634 (b=2), this sequence (b=3), A301635 (b=5).

%Y Cf. A176805, A180269.

%K nonn,more

%O 1,3

%A _N. J. A. Sloane_, Sep 04 2010, based on a posting to the Sequence Fans Mailing List by _Charles R Greathouse IV_, Aug 23 2010

%E More terms from _Charles R Greathouse IV_, Sep 07 2010

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 September 27 10:35 EDT 2020. Contains 337380 sequences. (Running on oeis4.)