A141976 Primes congruent to 27 mod 28.

83, 139, 167, 223, 251, 307, 419, 503, 587, 643, 727, 811, 839, 1063, 1091, 1231, 1259, 1399, 1427, 1483, 1511, 1567, 1847, 1931, 1987, 2099, 2239, 2267, 2351, 2659, 2687, 2939, 3023, 3079, 3163, 3191, 3331, 3359, 3499, 3527, 3583, 3779, 3863, 3919, 3947

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(5000) | p mod 28 eq 27 ]; // Vincenzo Librandi, Aug 17 2012

Mathematica

Select[Prime[Range[1500]],MemberQ[{27},Mod[#,28]]&] (* Vincenzo Librandi, Aug 17 2012 *)
Select[Range[27,4000,28],PrimeQ] (* Harvey P. Dale, May 14 2016 *)

PARI

is(n)=isprime(n) && n%28==27 \\ Charles R Greathouse IV, Jul 02 2016

Formula

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