

A124065


Numbers k such that 8*k  1 and 8*k + 1 are twin primes.


9



9, 24, 30, 39, 54, 75, 129, 144, 165, 186, 201, 234, 261, 264, 324, 336, 339, 375, 390, 396, 420, 441, 459, 471, 516, 534, 600, 621, 654, 660, 690, 705, 735, 795, 819, 849, 870, 891, 936, 945, 1011, 1029, 1125, 1155, 1179, 1215, 1221, 1251, 1284, 1395, 1419
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OFFSET

1,1


LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000


EXAMPLE

9 is in the sequence since 8*9  1 = 71 and 8*9 + 1 = 73 are twin primes.


MATHEMATICA

Select[Range[1500], And @@ PrimeQ[{1, 1} + 8# ] &] (* Ray Chandler, Nov 16 2006 *)


PROG

(MAGMA) [n: n in [1..2000]  IsPrime(8*n+1) and IsPrime(8*n1)] // Vincenzo Librandi, Mar 08 2010


CROSSREFS

Cf. A040040, A045753, A002822, A124518, A124519, A124520, A124521, A124522, A063983.
Sequence in context: A223297 A317493 A102217 * A121453 A003343 A047720
Adjacent sequences: A124062 A124063 A124064 * A124066 A124067 A124068


KEYWORD

nonn


AUTHOR

Artur Jasinski, Nov 04 2006


EXTENSIONS

Extended by Ray Chandler, Nov 16 2006


STATUS

approved



