|
Search: id:A005541
|
|
|
| A005541 |
|
Numbers n such that 8*3^n - 1 is prime.
(Formerly M1200)
|
|
+0
10
|
|
| 1, 2, 4, 10, 17, 50, 170, 184, 194, 209, 641, 1298, 4034, 5956, 7154, 9970
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
H. C. Williams and C. R. Zarnke, Some prime numbers of the forms 2*3^n+1 and 2*3^n-1, Math. Comp., 26 (1972), 995-998.
|
|
MATHEMATICA
|
lst={}; Do[If[PrimeQ[8*3^n-1], AppendTo[lst, n]], {n, 13^3}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 08 2008]
|
|
CROSSREFS
|
Cf. A003307, A002235, A046865, A079906, A046866, A001771, A056725, A046867, A079907.
Sequence in context: A152231 A034455 A057491 this_sequence A045955 A093695 A104723
Adjacent sequences: A005538 A005539 A005540 this_sequence A005542 A005543 A005544
|
|
KEYWORD
|
nonn,hard
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com).
|
|
EXTENSIONS
|
More terms from Douglas Burke (dburke(AT)nevada.edu) (no other terms below 12000).
|
|
|
Search completed in 0.002 seconds
|
