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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A153355 Numbers n such that 5n-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. [From 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,.... [From R. J. Mathar, Jan 03 2009]

EXAMPLE

For n=2, 5n-1=19; for n=30, 5n-1=149

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 * A024904 A172445 A274221

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 23 23:53 EDT 2017. Contains 286937 sequences.