A175152 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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