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A141883
Primes congruent to 9 mod 20.
16
29, 89, 109, 149, 229, 269, 349, 389, 409, 449, 509, 569, 709, 769, 809, 829, 929, 1009, 1049, 1069, 1109, 1129, 1229, 1249, 1289, 1409, 1429, 1489, 1549, 1609, 1669, 1709, 1789, 1889, 1949, 2029, 2069, 2089, 2129, 2269, 2309, 2389, 2549, 2609, 2689, 2729
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[9, 5000, 20], PrimeQ[#]&] (* Vladimir Joseph Stephan Orlovsky, Mar 31 2011*)
PROG
(Magma) [p: p in PrimesUpTo(3000) | p mod 20 eq 9 ]; // Vincenzo Librandi, Aug 16 2012
(PARI) is(n)=isprime(n) && n%20==9 \\ Charles R Greathouse IV, Jul 01 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved