A142371 Primes congruent to 20 mod 47.

67, 349, 443, 631, 1289, 1571, 1759, 2417, 2699, 2887, 3169, 3733, 4297, 4391, 4673, 4861, 5237, 5519, 5801, 6271, 6553, 7211, 7681, 7963, 8527, 9091, 9467, 9749, 10313, 10501, 11159, 12569, 12757, 13697, 14449, 14543, 14731, 15013, 15107, 15671, 15859

Offset

1,1

Links

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

Formula

a(n) ~ 46n log n. - Charles R Greathouse IV, Jul 03 2016

Mathematica

Select[Prime[Range[2500]], MemberQ[{20}, Mod[#, 47]]&] (* Vincenzo Librandi, Aug 27 2012 *)
Select[Range[20, 16000, 47], PrimeQ] (* Harvey P. Dale, Jun 01 2018 *)

Prog

(Magma) [p: p in PrimesUpTo(18000) | p mod 47 eq 20]; // Vincenzo Librandi, Aug 27 2012
(PARI) is(n)=isprime(n) && n%47==20 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A013533 A012865 A026911 * A142609 A262344 A323577

Adjacent sequences: A142368 A142369 A142370 * A142372 A142373 A142374

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved