A142372 Primes congruent to 21 mod 47.

397, 491, 773, 1619, 1901, 2089, 2371, 3217, 3499, 3593, 4157, 4721, 4909, 5003, 5849, 6037, 6131, 6883, 6977, 7541, 7823, 8011, 8293, 8387, 8669, 8951, 9421, 10079, 10267, 10831, 11113, 11489, 11677, 11959, 12241, 12899, 13463, 13933, 14591, 14779, 15061

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[{21}, Mod[#, 47]]&] (* Vincenzo Librandi, Aug 27 2012 *)
Select[Range[21, 16000, 47], PrimeQ] (* Harvey P. Dale, Jul 22 2016 *)

Prog

(Magma) [p: p in PrimesUpTo(18000) | p mod 47 eq 21]; // Vincenzo Librandi, Aug 27 2012
(PARI) is(n)=isprime(n) && n%47==21 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A074483 A023326 A139385 * A341187 A038660 A129190

Adjacent sequences: A142369 A142370 A142371 * A142373 A142374 A142375

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved