A175152 Numbers n such that 11n-1 and 11n+1 are twin primes.

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

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

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

Adjacent sequences: A175149 A175150 A175151 * A175153 A175154 A175155

Keyword

nonn,easy

Author

Vincenzo Librandi, Mar 08 2010

Status

approved