A141884 Primes congruent to 11 mod 20.

11, 31, 71, 131, 151, 191, 211, 251, 271, 311, 331, 431, 491, 571, 631, 691, 751, 811, 911, 971, 991, 1031, 1051, 1091, 1151, 1171, 1231, 1291, 1451, 1471, 1511, 1531, 1571, 1811, 1831, 1871, 1931, 1951, 2011, 2111, 2131, 2251, 2311, 2351, 2371, 2411, 2531, 2551

Offset

1,1

Links

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

Formula

a(n) ~ 8n log n. - Charles R Greathouse IV, Jul 03 2016

Mathematica

Select[Range[11, 5000, 20], PrimeQ[#]&] (* Vladimir Joseph Stephan Orlovsky, Mar 31 2011*)
Select[Prime[Range[400]], Mod[#, 20]==11&] (* Harvey P. Dale, Aug 10 2021 *)

Prog

(Magma) [p: p in PrimesUpTo(3000) | p mod 20 eq 11 ]; // Vincenzo Librandi, Aug 16 2012
(PARI) is(n)=isprime(n) && n%20==11 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040, A105854, A141881, A141882, A141883.

Sequence in context: A085715 A352954 A040973 * A139634 A173803 A124704

Adjacent sequences: A141881 A141882 A141883 * A141885 A141886 A141887

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved