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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A023216 Numbers n such that n and 4n + 9 both prime. 0
2, 5, 7, 11, 13, 23, 37, 41, 43, 47, 67, 71, 97, 103, 113, 137, 151, 163, 167, 173, 181, 191, 197, 211, 233, 251, 263, 271, 277, 293, 307, 317, 397, 401, 421, 431, 433, 463, 467, 491, 557, 571, 587, 593, 607, 617, 653, 683, 727, 757, 811, 823, 863, 877, 881, 883, 887, 907 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

PROG

(MAGMA) [n: n in [0..1000] | IsPrime(n) and IsPrime(4*n+9)] [From Vincenzo Librandi,

Nov 19 2010]

CROSSREFS

Sequence in context: A045347 A098170 A120330 * A079449 A038885 A079379

Adjacent sequences:  A023213 A023214 A023215 * A023217 A023218 A023219

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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 February 14 18:47 EST 2012. Contains 205663 sequences.