A142490 - OEIS

%I #9 Sep 08 2022 08:45:36

%S 23,227,431,839,941,1451,1553,2063,2267,2777,2879,3083,3389,3491,3593,

%T 3797,4001,4409,4817,4919,5021,5531,5939,6143,6449,6551,6653,6857,

%U 6959,7673,7877,8081,8387,8693,8999,9203,10223,10427,10529,10631,10733,10937,11243

%N Primes congruent to 23 mod 51.

%H Vincenzo Librandi, <a href="/A142490/b142490.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) ~ 32n log n. - _Charles R Greathouse IV_, Jul 03 2016

%t Select[Prime[Range[2400]], MemberQ[{23}, Mod[#, 51]] &] (* _Vincenzo Librandi_, Aug 28 2012 *)

%o (Magma) [p: p in PrimesUpTo(13000) | p mod 51 eq 23]; // _Vincenzo Librandi_, Aug 28 2012

%o (PARI) is(n)=isprime(n) && n%51==23 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A000040.

%K nonn,easy

%O 1,1

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