|
| |
|
|
A023303
|
|
Numbers n such that n remains prime through 4 iterations of function f(x) = 2x + 3.
|
|
2
| |
|
|
47, 67, 97, 137, 307, 1427, 2857, 6047, 6997, 9377, 12097, 16057, 24197, 32117, 35117, 36877, 44507, 46687, 54517, 55487, 64877, 71327, 71807, 76537, 89017, 92387, 94427, 100057, 132707, 142057, 153077, 160207, 184777, 186647, 194027, 200117, 205237
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Primes p such that (2p+3), (4p+9), (8p+21) and (16p+45) are also prime. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
|
|
|
PROG
| (MAGMA) [ p: p in PrimesUpTo(300000) | IsPrime(p) and IsPrime(2*p+3) and IsPrime(4*p+9) and IsPrime(8*p+21) and IsPrime(16*p+45)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
|
|
|
CROSSREFS
| Sequence in context: A099591 A046048 A163390 * A106874 A023331 A187923
Adjacent sequences: A023300 A023301 A023302 * A023304 A023305 A023306
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
|
| |
|
|
