A141974 Primes congruent to 23 mod 28.

23, 79, 107, 163, 191, 331, 359, 443, 499, 751, 863, 919, 947, 1031, 1087, 1171, 1283, 1367, 1423, 1451, 1619, 1759, 1787, 1871, 2011, 2039, 2179, 2207, 2347, 2459, 2543, 2683, 2711, 2767, 2851, 2879, 2963, 3019, 3187, 3271, 3299, 3467, 3607, 3691, 3719

Offset

1,1

Links

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

Formula

a(n) ~ 12n log n. - Charles R Greathouse IV, Jul 02 2016

Mathematica

Select[Prime[Range[1500]], MemberQ[{23}, Mod[#, 28]]&] (* Vincenzo Librandi, Aug 17 2012 *)
Select[Range[23, 4000, 28], PrimeQ] (* Harvey P. Dale, Nov 24 2017 *)

Prog

(Magma) [p: p in PrimesUpTo(5000) | p mod 28 eq 23 ]; // Vincenzo Librandi, Aug 17 2012
(PARI) is(n)=isprime(n) && n%28==23 \\ Charles R Greathouse IV, Jul 02 2016

Crossrefs

Cf. A000040.

Sequence in context: A102109 A238677 A302281 * A364148 A142650 A078597

Adjacent sequences: A141971 A141972 A141973 * A141975 A141976 A141977

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved