A141963 - OEIS

%I #12 Sep 08 2022 08:45:35

%S 23,131,239,293,347,401,509,563,617,887,941,1049,1103,1319,1373,1427,

%T 1481,1697,1913,2129,2237,2399,2777,2939,3209,3371,3533,3803,3911,

%U 4019,4073,4127,4289,4397,4451,4721,4937,5099,5153,5261,5477,5531,5639,5693,5801

%N Primes congruent to 23 mod 27.

%H Vincenzo Librandi, <a href="/A141963/b141963.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) ~ 18n log n. - _Charles R Greathouse IV_, Jul 02 2016

%t Select[Range[23, 30000, 27], PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Jun 21 2011 *)

%o (Magma) [p: p in PrimesUpTo(7000) | p mod 27 eq 23 ]; // _Vincenzo Librandi_, Aug 16 2012

%o (PARI) is(n)=isprime(n) && n%27==23 \\ _Charles R Greathouse IV_, Jul 02 2016

%Y Cf. A000040, A141964, A141965.

%K nonn,easy

%O 1,1

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