login
A175152
Numbers n such that 11n-1 and 11n+1 are twin primes.
2
18, 42, 60, 78, 120, 132, 192, 210, 270, 288, 300, 372, 378, 402, 480, 498, 522, 570, 648, 678, 690, 822, 840, 858, 888, 948, 990, 1032, 1050, 1140, 1182, 1218, 1302, 1308, 1422, 1452, 1512, 1530, 1548, 1572, 1590, 1740, 1770, 1938, 1968, 2010, 2052, 2058
OFFSET
1,1
LINKS
EXAMPLE
For n=18, 11*18-1=197 and 11*18+1=199
MATHEMATICA
Select[Range[3000], PrimeQ[11 # - 1]&& PrimeQ[11 # + 1]&] (* Vincenzo Librandi, Apr 05 2013 *)
PROG
(Magma) [n: n in [1..3000] | IsPrime(11*n+1) and IsPrime(11*n-1)]
CROSSREFS
Sequence in context: A124792 A090605 A318168 * A105550 A144737 A333457
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Mar 08 2010
STATUS
approved