login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 28 22:40 EST 2020. Contains 331328 sequences. (Running on oeis4.)