A141870 - OEIS

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

%S 23,61,137,251,479,593,631,821,859,1049,1087,1163,1201,1277,1429,1543,

%T 1619,1657,1733,1847,1999,2113,2341,2417,2531,2683,2797,3253,3329,

%U 3557,3671,3709,3823,4013,4051,4127,4241,4507,4583,4621,5039,5077,5153,5381,5419

%N Primes congruent to 4 mod 19.

%H Vincenzo Librandi, <a href="/A141870/b141870.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) ~ 18n log n. - _Charles R Greathouse IV_, Jul 03 2016

%t Select[Range[4,5000,19],PrimeQ[#]&] (* _Vladimir Joseph Stephan Orlovsky_, Mar 31 2011*)

%o (Magma) [p: p in PrimesUpTo(8000) | p mod 19 eq 4 ]; // _Vincenzo Librandi_, Aug 15 2012

%o (PARI) is(n)=isprime(n) && n%19==4 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A105854, A141881, A141882, A141883.

%K nonn,easy

%O 1,1

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