A142220 Primes congruent to 23 mod 41.

23, 269, 433, 761, 1171, 1499, 1663, 2237, 2647, 2729, 3221, 3467, 3631, 3877, 4451, 4861, 4943, 5107, 5189, 5927, 6091, 6173, 6337, 6829, 6911, 7321, 7649, 8059, 8387, 9043, 9371, 9781, 10273, 10601, 10847, 11093, 11257, 11503, 11831, 12241, 12323, 12487

Offset: 1

Author

N. J. A. Sloane, Jul 11 2008

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A000040.

Programs

Magma

[p: p in PrimesUpTo(17000) | p mod 41 eq 23 ]; // Vincenzo Librandi, Aug 24 2012

Mathematica

Select[Prime[Range[5000]],MemberQ[{23},Mod[#,41]]&] (* Vincenzo Librandi, Aug 24 2012 *)
Select[Range[23,13000,41],PrimeQ] (* Harvey P. Dale, Aug 21 2016 *)

PARI

is(n)=isprime(n) && n%41==23 \\ Charles R Greathouse IV, Jul 02 2016

Formula

a(n) ~ 40n log n. - Charles R Greathouse IV, Jul 02 2016