A142027 Primes congruent to 23 mod 31.

23, 271, 457, 643, 829, 953, 1201, 1511, 1697, 1759, 2069, 2131, 2441, 2503, 2689, 2999, 3061, 3371, 3433, 3557, 3929, 4177, 4363, 4549, 4673, 5107, 5231, 5417, 5479, 5851, 6037, 6719, 6781, 6967, 7649, 8269, 8641, 8951, 9013, 9137, 9199, 9323, 10067, 10253

Offset

1,1

Links

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

Formula

a(n) ~ 30n log n. - Charles R Greathouse IV, Jul 02 2016

Mathematica

Select[Range[23, 20000, 31], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Apr 30 2011 *)
Select[Prime[Range[1300]], Mod[#, 31]==23&] (* Harvey P. Dale, Sep 05 2023 *)

Prog

(Magma) [p: p in PrimesUpTo(12000) | p mod 31 eq 23 ]; // Vincenzo Librandi, Aug 17 2012
(PARI) is(n)=isprime(n) && n%31==23 \\ Charles R Greathouse IV, Jul 02 2016

Crossrefs

Cf. A000040, A142005, A142006, A142023.

Sequence in context: A240876 A142220 A257930 * A161523 A161930 A162365

Adjacent sequences: A142024 A142025 A142026 * A142028 A142029 A142030

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved