login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A068603 Numbers n such that prime(n)+prime(2n)+prime(3n) is prime. 1
2, 3, 12, 14, 17, 18, 19, 27, 29, 30, 31, 33, 34, 35, 36, 41, 43, 48, 49, 56, 57, 63, 66, 71, 77, 78, 79, 80, 92, 95, 102, 106, 108, 109, 113, 116, 118, 121, 125, 130, 134, 141, 142, 146, 147, 158, 162, 164, 168, 179, 182, 184, 187, 190, 194, 201, 204, 209, 211, 214 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[225], PrimeQ[Prime[#]+Prime[2#]+Prime[3#]]&]  (* Harvey P. Dale, Jan 16 2011 *)

CROSSREFS

Sequence in context: A024579 A291565 A299545 * A045878 A295398 A138321

Adjacent sequences:  A068600 A068601 A068602 * A068604 A068605 A068606

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Mar 28 2002

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 17 09:20 EDT 2022. Contains 353741 sequences. (Running on oeis4.)