A142433 Primes congruent to 23 mod 49.

23, 317, 709, 1297, 1493, 1787, 2081, 2179, 2473, 2767, 2963, 3061, 3257, 3943, 4139, 5021, 5119, 5413, 5903, 6197, 6491, 6883, 7079, 7177, 8059, 8353, 8647, 8941, 9137, 9431, 10313, 10607, 11489, 11587, 11783, 12763, 12959, 13841, 14723, 14821, 15017

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 49 eq 23]; // Vincenzo Librandi; Aug 28 2012

Mathematica

Select[Prime[Range[2500]], MemberQ[{23}, Mod[#,49]] &] (* Vincenzo Librandi, Aug 28 2012 *)
Select[Range[23,16000,49],PrimeQ] (* Harvey P. Dale, Sep 13 2018 *)

PARI

is(n)=isprime(n) && n%49==23 \\ Charles R Greathouse IV, Jul 02 2016

Formula

a(n) ~ 42n log n. - Charles R Greathouse IV, Jul 02 2016