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A141884 Primes congruent to 11 mod 20. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 3 23:46 EST 2022. Contains 358544 sequences. (Running on oeis4.)