|
Search: id:A153768
|
|
|
| A153768 |
|
Numbers n such that n, 8n-9 and 8n+9 are prime. |
|
+0
3
|
|
| 11, 29, 31, 109, 199, 251, 269, 379, 419, 521, 599, 601, 661, 881, 991, 1091, 1231, 1289, 1789, 1831, 1861, 1901, 1949, 2239, 2689, 2969, 3181, 3251, 3301, 3359, 3499, 3779, 3821, 4099, 4201, 4339, 4561, 4651, 4679, 4789, 4871, 5281, 5471, 5641, 5659
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
EXAMPLE
|
For n=11, 8n-9=79, 8n+9=97; n=199, 8n-9=1583, 8n+9=1601
|
|
MATHEMATICA
|
lst={}; Do[p=Prime[n]; If[PrimeQ[8*p-9]&&PrimeQ[8*p+9], AppendTo[lst, p]], {n, 7!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 16 2009]
|
|
CROSSREFS
|
Cf. A153766, A153767, A153762
Sequence in context: A059337 A126240 A124110 this_sequence A092194 A134307 A087693
Adjacent sequences: A153765 A153766 A153767 this_sequence A153769 A153770 A153771
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 01 2009
|
|
EXTENSIONS
|
241 replaced by 251 and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 07 2009
|
|
|
Search completed in 0.002 seconds
|
