A141909 - OEIS

%I #17 Sep 08 2022 08:45:35

%S 73,211,257,349,487,809,947,1039,1223,1361,1453,1499,1637,1867,1913,

%T 2143,2281,2557,2741,2833,2879,2971,3109,4259,4397,4673,4903,5087,

%U 5179,5501,5639,5869,6007,6053,6329,6421,7019,7433,8123,8353,8537,8629,8951,9043

%N Primes congruent to 4 mod 23.

%H Vincenzo Librandi, <a href="/A141909/b141909.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) ~ 22n log n. - _Charles R Greathouse IV_, Jul 03 2016

%t Select[Range[4,10000,23],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Apr 05 2011 *)

%o (Magma) [p: p in PrimesUpTo(10000) | p mod 23 eq 4 ]; // _Vincenzo Librandi_, Aug 16 2012

%o (PARI) is(n)=isprime(n) && n%23==4 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A000040, A040984, A141908, A100201.

%K nonn,easy

%O 1,1

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