A141856 Primes congruent to 9 mod 11.

31, 53, 97, 163, 229, 251, 317, 383, 449, 647, 691, 757, 823, 911, 977, 1021, 1087, 1109, 1153, 1307, 1373, 1439, 1483, 1549, 1571, 1637, 1747, 1879, 1901, 2011, 2099, 2143, 2297, 2341, 2473, 2539, 2671, 2693, 2803, 2957, 3001, 3023, 3067, 3089, 3221, 3331

Offset: 1

Author

N. J. A. Sloane, Jul 11 2008

Keywords

• nonn
• easy

Comments

Primes congruent to 9 mod 22. - Chai Wah Wu, Apr 29 2025

Links

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

Programs

Magma

[ p: p in PrimesUpTo(5000) | p mod 11 eq 9 ]; // Vincenzo Librandi, Apr 19 2011

Mathematica

Select[Range[9, 50000, 11], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Jun 13 2011 *)

PARI

is(n)=isprime(n) && n%11==9 \\ Charles R Greathouse IV, Jul 02 2016

Formula

a(n) ~ 10n log n. - Charles R Greathouse IV, Jul 02 2016