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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A023205 Numbers n such that n and 2n + 5 both prime. 4
3, 7, 13, 19, 31, 37, 61, 67, 73, 79, 97, 103, 109, 139, 151, 163, 181, 229, 241, 271, 283, 307, 313, 367, 373, 409, 439, 457, 523, 541, 613, 643, 661, 709, 727, 733, 739, 769, 787, 811, 829, 859, 877, 937, 991, 997, 1039, 1063, 1069, 1087, 1117, 1123, 1153, 1171 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

MATHEMATICA

Select[Prime@Range@250, PrimeQ[2#+5]&] (* From Vladimir Joseph Stephan Orlovsky, Apr 25 2011 *)

PROG

(MAGMA) [n: n in [0..100000] | IsPrime(n) and IsPrime(2*n+5)] [From Vincenzo Librandi, Aug 04 2010]

CROSSREFS

Cf. A005384, A023204.

Sequence in context: A086135 A023220 A207990 * A167473 A103521 A103966

Adjacent sequences:  A023202 A023203 A023204 * A023206 A023207 A023208

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 | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified May 18 17:25 EDT 2013. Contains 225422 sequences.