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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

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

Cf. A000040, A105854, A141881, A141882.

Sequence in context: A042660 A047650 A308787 * A142791 A325073 A152294

Adjacent sequences: A141880 A141881 A141882 * A141884 A141885 A141886

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jul 11 2008

STATUS

approved

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Last modified November 26 20:27 EST 2022. Contains 358362 sequences. (Running on oeis4.)