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%I #24 Sep 08 2022 08:45:35
%S 19,59,79,139,179,199,239,359,379,419,439,479,499,599,619,659,719,739,
%T 839,859,919,1019,1039,1259,1279,1319,1399,1439,1459,1499,1559,1579,
%U 1619,1699,1759,1879,1979,1999,2039,2099,2179,2239,2339,2399,2459,2539,2579,2659
%N Primes congruent to 19 mod 20.
%H Vincenzo Librandi, <a href="/A141887/b141887.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[19,5000,20],PrimeQ[#]&] (* _Vladimir Joseph Stephan Orlovsky_, Mar 31 2011*)
%o (Magma) [p: p in PrimesUpTo(3000) | p mod 20 eq 19 ]; // _Vincenzo Librandi_, Aug 16 2012
%o (PARI) is(n)=isprime(n) && n%20==19 \\ _Charles R Greathouse IV_, Jul 01 2016
%Y Cf. A000040, A105854, A141881, A141882, A141883.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 11 2008
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