|
| |
|
|
A057327
|
|
First member of a prime quadruple in a 2p-1 progression.
|
|
9
| |
|
|
1531, 2131, 2311, 3061, 6211, 6841, 7411, 10321, 13681, 15391, 16651, 18121, 22531, 23011, 24391, 29671, 30781, 31771, 33301, 35311, 41491, 44371, 46411, 54601, 56311, 57991, 60331, 61381, 66601, 67651, 78031, 83431, 85381, 88741
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,1
|
|
|
COMMENTS
| Numbers n such that n remains prime through 3 iterations of function f(x) = 2x - 1.
|
|
|
LINKS
| Index entries for sequences related to primes in arithmetic progressions
|
|
|
EXAMPLE
| Quadruplets are (1531,3061,6121,12241),(2131,4261,8521,17041),...
|
|
|
CROSSREFS
| Cf. (A005382 and A005383), A057326, A057328, A057329, A057330, A005603.
Sequence in context: A031717 A030061 A122707 * A057328 A110022 A145982
Adjacent sequences: A057324 A057325 A057326 * A057328 A057329 A057330
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 2000.
|
| |
|
|
