A142647 - OEIS

%I #9 Sep 08 2022 08:45:37

%S 71,127,239,463,631,743,911,967,1303,1471,1583,2087,2143,2311,2423,

%T 2591,2647,2927,3319,3767,3823,4159,4271,4327,4663,4831,4943,4999,

%U 5167,5279,5503,5783,5839,6007,6287,6343,6679,6791,6959,7127,7351,7687,8191,8527

%N Primes congruent to 15 mod 56.

%H Vincenzo Librandi, <a href="/A142647/b142647.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime[Range[1300]], MemberQ[{15}, Mod[#, 56]] &] (* _Vincenzo Librandi_, Sep 01 2012 *)

%t Select[Range[15,9000,56],PrimeQ] (* _Harvey P. Dale_, Sep 25 2015 *)

%o (Magma) [p: p in PrimesUpTo(10000) | p mod 56 eq 15 ]; // _Vincenzo Librandi_, Sep 01 2012

%Y Cf. A000040.

%K nonn,easy

%O 1,1

%A _N. J. A. Sloane_, Jul 11 2008