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 A140506 Primes congruent to 11 or 19 mod 30. 1

%I

%S 11,19,41,71,79,101,109,131,139,191,199,229,251,281,311,349,379,401,

%T 409,431,439,461,491,499,521,619,641,701,709,739,761,769,821,829,859,

%U 881,911,919,941,971,1009,1031,1039,1061,1069,1091,1129,1151,1181,1249,1279

%N Primes congruent to 11 or 19 mod 30.

%H Vincenzo Librandi, <a href="/A140506/b140506.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime[Range[250]],Mod[#,30]==19||Mod[#,30]==11&] [From Harvey P. Dale, Dec. 28, 2010]

%t Select[Prime[Range[210]],MemberQ[{11,19},Mod[#,30]]&] (* _Vincenzo Librandi_, Aug 15 2012 *)

%o (MAGMA) [p: p in PrimesUpTo(3000)|p mod 30 in {11,19}]; // _Vincenzo Librandi_, Dec 18 2010

%Y Cf. A000040.

%K nonn,easy

%O 1,1

%A _Juri-Stepan Gerasimov_ Jul 28 2008

%E Corrected by _Charles R Greathouse IV_, Mar 25 2010

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