|
| |
|
|
A153355
|
|
Numbers k such that 5k-1 is a prime.
|
|
3
|
|
|
|
4, 6, 12, 16, 18, 22, 28, 30, 36, 40, 46, 48, 54, 70, 72, 76, 78, 82, 84, 88, 90, 96, 100, 102, 114, 120, 124, 132, 142, 144, 148, 154, 162, 166, 168, 172, 184, 186, 202, 204, 208, 210, 214, 222, 226, 246, 250, 252, 256, 258, 264, 280, 282, 286, 288, 292, 298
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
One more than the value of A024897 at the same index. - R. J. Mathar, Jan 05 2009
|
|
|
LINKS
|
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
|
|
|
FORMULA
|
The set of numbers (1+A030433(k))/5, k=1,2,3,4,.... - R. J. Mathar, Jan 03 2009
|
|
|
EXAMPLE
|
5*4 - 1 = 19 is a prime, so 4 is a term;
5*30 - 1 = 149 is a prime, so 30 is a term.
|
|
|
MATHEMATICA
|
Select[Range[400], PrimeQ[5#-1]&] (* Vladimir Joseph Stephan Orlovsky, Feb 25 2011*)
|
|
|
PROG
|
(Magma) [n: n in [0..300] | IsPrime(5*n - 1)]; // Vincenzo Librandi, Sep 24 2012
|
|
|
CROSSREFS
|
Sequence in context: A104236 A265225 A122781 * A341274 A310597 A310598
Adjacent sequences: A153352 A153353 A153354 * A153356 A153357 A153358
|
|
|
KEYWORD
|
nonn,easy
|
|
|
AUTHOR
|
Vincenzo Librandi, Dec 24 2008
|
|
|
EXTENSIONS
|
Extended by R. J. Mathar, Jan 05 2009
|
|
|
STATUS
|
approved
|
| |
|
|
