|
| |
|
|
A157977
|
|
Numbers n such that n and 20*n+19 are primes.
|
|
2
| |
|
|
2, 3, 11, 17, 23, 29, 41, 71, 101, 149, 167, 233, 239, 251, 263, 269, 281, 293, 317, 347, 353, 401, 449, 461, 491, 503, 557, 563, 569, 647, 683, 743, 797, 857, 941, 947, 953, 977, 1019, 1031, 1091, 1103, 1151, 1163, 1193, 1217, 1283, 1289, 1319, 1361, 1373
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
MATHEMATICA
| q=19; lst={}; Do[p=Prime[n]; If[PrimeQ[(q+1)*p+q], AppendTo[lst, p]], {n, 6!}]; lst
Select[Prime[Range[250]], PrimeQ[20#+19]&] (* From Harvey P. Dale, July 04 2011 *)
|
|
|
CROSSREFS
| Cf. A136082, A136083, A023213, A023221, A023235, A023240, A157974, A136083, A136084, A136085, A136086, A136087, A089440, A157975, A157976
Sequence in context: A025584 A189483 A164952 * A105903 A045338 A038907
Adjacent sequences: A157974 A157975 A157976 * A157978 A157979 A157980
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 10 2009
|
| |
|
|
