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Numbers n such that 11*n - 7 is prime.
1

%I #13 Aug 16 2019 14:02:57

%S 4,6,10,18,24,34,36,40,46,48,54,58,60,66,76,90,96,100,108,118,130,136,

%T 138,148,156,160,174,178,180,184,186,190,204,208,214,240,244,246,264,

%U 270,298,306,316,318,324,330,340,348,358,366,376,384,388,390,394,396

%N Numbers n such that 11*n - 7 is prime.

%H A.H.M. Smeets, <a href="/A108232/b108232.txt">Table of n, a(n) for n = 1..20000</a>

%e If n=4, then 11*n - 7 = 37 (prime).

%e If n=48, then 11*n - 7 = 521 (prime).

%p a:=proc(n) if isprime(11*n-7)=true then n else fi end: seq(a(n),n=1..450); # _Emeric Deutsch_, Jun 26 2005

%t Select[Range[500],PrimeQ[11#-7]&] (* _Harvey P. Dale_, Jul 16 2014 *)

%o (PARI) is(n)=isprime(11*n-7) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A108187.

%K nonn,easy

%O 1,1

%A _Parthasarathy Nambi_, Jun 16 2005

%E More terms from _Emeric Deutsch_, Jun 26 2005