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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A023325 Numbers n such that n remains prime through 4 iterations of function f(x) = 9x + 4. 2
3, 107, 421, 773, 1567, 1637, 3793, 4111, 6961, 12721, 14107, 17851, 26267, 26557, 31327, 33503, 37003, 42281, 57947, 60091, 65423, 67427, 68447, 75721, 82223, 82657, 87877, 96377, 108107, 111373, 113171, 122117, 123887, 125497, 125887, 127301 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

n, 9*n+4, 81*n+40, 729*n+364 and 6561*n+3280 are primes. - Vincenzo Librandi, Aug 04 2010

LINKS

John Cerkan, Table of n, a(n) for n = 1..10000

PROG

(MAGMA) [n: n in [1..5000000] | IsPrime(n) and IsPrime(9*n+4) and IsPrime(81*n+40) and IsPrime(729*n+364) and IsPrime(6561*n+3280)] // Vincenzo Librandi, Aug 04 2010

CROSSREFS

Subsequence of A023234, A023266, and A023297.

Sequence in context: A176807 A301369 A142509 * A094200 A003705 A146214

Adjacent sequences:  A023322 A023323 A023324 * A023326 A023327 A023328

KEYWORD

nonn

AUTHOR

David W. Wilson

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 June 19 17:16 EDT 2019. Contains 324222 sequences. (Running on oeis4.)